Postfix
Backscatter HowtoPostfix
Backscatter HowtoThis document describes features that require Postfix version 2.0 or later.
Topics covered in this document:
The examples use Perl Compatible Regular Expressions (Postfix pcre: tables), but also provide a translation to POSIX regular expressions (Postfix regexp: tables). PCRE is preferred primarily because the implementation is often faster.
When a spammer or worm sends mail with forged sender addresses, innocent sites are flooded with undeliverable mail notifications. This is called backscatter mail. With Postfix, you know that you're a backscatter victim when your logfile goes on and on like this:
Dec 4 04:30:09 hostname postfix/smtpd[58549]: NOQUEUE: reject: RCPT from xxxxxxx[x.x.x.x]: 550 5.1.1 <yyyyyy@@your.domain.here>: Recipient address rejected: User unknown; from=<> to=<yyyyyy@@your.domain.here> proto=ESMTP helo=<zzzzzz>
What you see are lots of "user unknown" errors with "from=<>". These are error reports from MAILER-DAEMONs elsewhere on the Internet.
If your machine receives backscatter mail to random addresses, configure Postfix to reject all mail for non-existent recipients as described in the LOCAL_RECIPIENT_README and STANDARD_CONFIGURATION_README documentation.
If your machine runs Postfix 2.0 and earlier, disable the "pause before reject" feature in the SMTP server. If your system is under stress then it should not waste time.
/etc/postfix/main.cf: # Not needed with Postfix 2.1 and later. smtpd_error_sleep_time = 0 # Not needed with Postfix 2.4 and later. unknown_local_recipient_reject_code = 550
When backscatter mail passes the "unknown recipient" barrier, there still is no need to despair. Many mail systems are kind enough to attach the message headers of the undeliverable mail in the non-delivery notification. These message headers contain information that you can use to recognize and block forged mail.
Although my email address is "wietse@@porcupine.org", all my mail systems announce themselves with the SMTP HELO command as "hostname.porcupine.org". Thus, if returned mail has a Received: message header like this:
Received: from porcupine.org ...
Then I know that this is almost certainly forged mail (almost; see next section for the fly in the ointment). Mail that is really sent by my systems looks like this:
Received: from hostname.porcupine.org ...
For the same reason the following message headers are very likely to be the result of forgery:
Received: from host.example.com ([1.2.3.4] helo=porcupine.org) ... Received: from [1.2.3.4] (port=12345 helo=porcupine.org) ... Received: from host.example.com (HELO porcupine.org) ... Received: from host.example.com (EHLO porcupine.org) ...
Some forgeries show up in the way that a mail server reports itself in Received: message headers. Keeping in mind that all my systems have a mail server name of hostname.porcupine.org, the following is definitely a forgery:
Received: by porcupine.org ... Received: from host.example.com ( ... ) by porcupine.org ...
Another frequent sign of forgery is the Message-ID: header. My systems produce a Message-ID: of <stuff@@hostname.porcupine.org>. The following are forgeries, especially the first one:
Message-ID: <1cb479435d8eb9.2beb1.qmail@@porcupine.org> Message-ID: <yulszqocfzsficvzzju@@porcupine.org>
To block such backscatter I use header_checks and body_checks patterns like this:
/etc/postfix/main.cf: header_checks = pcre:/etc/postfix/header_checks body_checks = pcre:/etc/postfix/body_checks /etc/postfix/header_checks: if /^Received:/ /^Received: +from +(porcupine\.org) +/ reject forged client name in Received: header: $1 /^Received: +from +[^ ]+ +\(([^ ]+ +[he]+lo=|[he]+lo +)(porcupine\.org)\)/ reject forged client name in Received: header: $2 /^Received:.* +by +(porcupine\.org)\b/ reject forged mail server name in Received: header: $1 endif /^Message-ID:.* <!&!/ DUNNO /^Message-ID:.*@@(porcupine\.org)/ reject forged domain name in Message-ID: header: $1 /etc/postfix/body_checks: if /^[> ]*Received:/ /^[> ]*Received: +from +(porcupine\.org) / reject forged client name in Received: header: $1 /^[> ]*Received: +from +[^ ]+ +\(([^ ]+ +[he]+lo=|[he]+lo +)(porcupine\.org)\)/ reject forged client name in Received: header: $2 /^[> ]*Received:.* +by +(porcupine\.org)\b/ reject forged mail server name in Received: header: $1 endif /^[> ]*Message-ID:.* <!&!/ DUNNO /^[> ]*Message-ID:.*@@(porcupine\.org)/ reject forged domain name in Message-ID: header: $1
Notes:
The example uses pcre: tables mainly for speed; with minor modifications, you can use regexp: tables as explained below.
The example is simplified for educational purposes. In reality my patterns list multiple domain names, as "(domain|domain|...)".
The "\." matches "." literally. Without the "\", the "." would match any character.
The "\(" and "\)" match "(" and ")" literally. Without the "\", the "(" and ")" would be grouping operators.
The "\b" is used here to match the end of a word. If you use regexp: tables, specify "[[:>:]]" (on some systems you should specify "\>" instead; for details see your system documentation).
The "if /pattern/" and "endif" eliminate unnecessary matching attempts. DO NOT indent lines starting with /pattern/ between the "if" and "endif"!
The two "Message-ID:.* <!&!" rules are workarounds for some versions of Outlook express, as described in the caveats section below.
Netscape Messenger (and reportedly, Mozilla) sends a HELO name that is identical to the sender address domain part. If you have such clients then the above patterns would block legitimate email.
My network has only one such machine, and to prevent its mail from being blocked I have configured it to send mail as user@@hostname.porcupine.org. On the Postfix server, a canonical mapping translates this temporary address into user@@porcupine.org.
/etc/postfix/main.cf: canonical_maps = hash:/etc/postfix/canonical /etc/postfix/canonical: @@hostname.porcupine.org @@porcupine.org
This is of course practical only when you have very few systems that send HELO commands like this, and when you never have to send mail to a user on such a host.
An alternative would be to remove the hostname from "hostname.porcupine.org" with address masquerading, as described in the ADDRESS_REWRITING_README document.
Reportedly, Outlook 2003 (perhaps Outlook Express, and other versions as well) present substantially different Message-ID headers depending upon whether or not a DSN is requested (via Options "Request a delivery receipt for this message").
When a DSN is requested, Outlook 2003 uses a Message-ID string that ends in the sender's domain name:
Message-ID: <!&! ...very long string... ==@@example.com>
where example.com is the domain name part of the email address specified in Outlook's account settings for the user. Since many users configure their email addresses as username@@example.com, messages with DSN turned on will trigger the REJECT action in the previous section.
If you have such clients then you can to exclude their Message-ID strings with the two "Message-ID:.* <!&!" patterns that are shown in the previous section. Otherwise you will not be able to use the two backscatter rules to stop forged Message ID strings. Of course this workaround may break the next time Outlook is changed.
/etc/postfix/main.cf: header_checks = pcre:/etc/postfix/header_checks body_checks = pcre:/etc/postfix/body_checks /etc/postfix/header_checks: /^(From|Return-Path):.*\b(user@@domain\.tld)\b/ reject forged sender address in $1: header: $2 /etc/postfix/body_checks: /^[> ]*(From|Return-Path):.*\b(user@@domain\.tld)\b/ reject forged sender address in $1: header: $2
Notes:
The example uses pcre: tables mainly for speed; with minor modifications, you can use regexp: tables as explained below.
The example is simplified for educational purposes. In reality, my patterns list multiple email addresses as "(user1@@domain1\.tld|user2@@domain2\.tld)".
The two "\b" as used in "\b(user@@domain\.tld)\b" match the beginning and end of a word, respectively. If you use regexp: tables, specify "[[:<:]] and [[:>:]]" (on some systems you should specify "\< and \>" instead; for details see your system documentation).
The "\." matches "." literally. Without the "\", the "." would match any character.
Another sign of forgery can be found in the IP address that is recorded in Received: headers next to your HELO host or domain name. This information must be used with care, though. Some mail servers are behind a network address translator and never see the true client IP address.
With all the easily recognizable forgeries eliminated, there is one category of backscatter mail that remains, and that is notifications from virus scanner software. Unfortunately, some virus scanning software doesn't know that viruses forge sender addresses. To make matters worse, the software also doesn't know how to report a mail delivery problem, so that we cannot use the above techniques to recognize forgeries.
Recognizing virus scanner mail is an error prone process, because there is a lot of variation in report formats. The following is only a small example of message header patterns. For a large collection of header and body patterns that recognize virus notification email, see http://www.dkuug.dk/keld/virus/ or http://www.t29.dk/antiantivirus.txt.
/etc/postfix/header_checks:
/^Subject: *Your email contains VIRUSES/ DISCARD virus notification
/^Content-Disposition:.*VIRUS1_DETECTED_AND_REMOVED/
DISCARD virus notification
/^Content-Disposition:.*VirusWarning.txt/ DISCARD virus notification
Note: these documents haven't been updated since 2004, so they are useful only as a starting point.
A plea to virus or spam scanner operators: please do not make the problem worse by sending return mail to forged sender addresses. You're only harassing innocent people. If you must return mail to the purported sender, please return the full message headers, so that the sender can filter out the obvious forgeries.
@ 1.1.1.1 log @Import Postfix 2.6.2. @ text @@ 1.1.1.1.6.1 log @Sync with HEAD @ text @d79 1 a79 2 These are error reports from MAILER-DAEMONs elsewhere on the Internet, about email that was sent with a false sender address in your domain. a185 1 # Do not indent the text between "if" and "endif". a198 1 # Do not indent the text between "if" and "endif". @ 1.1.1.2 log @Import Postfix 2.8.1. Changes since version 2.7.*: Postfix stable release 2.8.0 is available. This release continues the move towards improving code and documentation, and making the system better prepared for changes in the threat environment. The postscreen daemon (a zombie blocker in front of Postfix) is now included with the stable release. postscreen now supports TLS and can log the rejected sender, recipient and helo information. See the POSTSCREEN_README file for recommended usage scenarios. Support for DNS whitelisting (permit_rhswl_client), and for pattern matching to filter the responses from DNS white/blacklist servers (e.g., reject_rhsbl_client zen.spamhaus.org=127.0.0.[1..10]). Improved message tracking across SMTP-based content filters; the after-filter SMTP server can log the before-filter queue ID (the XCLIENT protocol was extended). Read-only support for sqlite databases. See sqlite_table(5) and SQLITE_README. Support for 'footers' that are appended to SMTP server "reject" responses. See "smtpd_reject_footer" in the postconf(5) manpage. @ text @d79 1 a79 2 These are error reports from MAILER-DAEMONs elsewhere on the Internet, about email that was sent with a false sender address in your domain. a185 1 # Do not indent the text between "if" and "endif". a198 1 # Do not indent the text between "if" and "endif". @ 1.1.1.2.10.1 log @resync with head @ text @d187 1 a187 1 # Do not indent the patterns between "if" and "endif". d201 1 a201 1 # Do not indent the patterns between "if" and "endif". @ 1.1.1.2.10.2 log @Rebase to HEAD as of a few days ago. @ text @d198 1 a198 1 reject forged domain name in Message-ID: header: $1 d212 1 a212 1 reject forged domain name in Message-ID: header: $1 d269 1 a269 1 canonical_maps = hash:/etc/postfix/canonical @ 1.1.1.2.4.1 log @sync with head @ text @d187 1 a187 1 # Do not indent the patterns between "if" and "endif". d201 1 a201 1 # Do not indent the patterns between "if" and "endif". @ 1.1.1.3 log @Import Postfix 2.9.5. Major changes since version 2.8.x: - Support for long, non-repeating, queue IDs (queue file names). The main benefit of non-repeating names is simpler logfile analysis. See the description of "enable_long_queue_ids" in postconf(5) for details. - Memcache client support, and support to share postscreen(8) and verify(8) caches via the proxymap server. Details about memcache support are in memcache_table(5) and MEMCACHE_README. - Gradual degradation: if a database is unavailable (can't open, most read or write errors) a Postfix daemon will log a warning and continue providing the services that don't depend on that table, instead of immediately terminating with a fatal error. To terminate immediately when a database file can't be opened, specify "daemon_table_open_error_is_fatal = yes". - Revised postconf(1) command. It warns about unused parameter name=value settings in main.cf or master.cf (likely mistakes), understands "dynamic" parameter names such as names that depend on the name of a master.cf entry (finally, "postconf -n" shows all parameter settings), and it can display main.cf and master.cf in a more user-friendly format (postconf -nf, postconf -Mf). - Read/write deadline support in the SMTP client and server to defend against application-level DOS attacks that very slowly write or read data one byte at a time. @ text @d187 1 a187 1 # Do not indent the patterns between "if" and "endif". d201 1 a201 1 # Do not indent the patterns between "if" and "endif". @ 1.1.1.3.6.1 log @Rebase. @ text @d198 1 a198 1 reject forged domain name in Message-ID: header: $1 d212 1 a212 1 reject forged domain name in Message-ID: header: $1 d269 1 a269 1 canonical_maps = hash:/etc/postfix/canonical @ 1.1.1.4 log @Import Postfix 2.11.1. The main changes since version 2.10.* are: - Support for PKI-less TLS server certificate verification with DANE (DNS-based Authentication of Named Entities) where the CA public key or the server certificate is identified via DNSSEC lookup. This requires a DNS resolver that validates DNSSEC replies. The problem with conventional PKI is that there are literally hundreds of organizations world-wide that can provide a certificate in anyone's name. DANE limits trust to the people who control the target DNS zone and its parent zones. - A new postscreen_dnsbl_whitelist_threshold feature to allow clients to skip postscreen tests based on their DNSBL score. This can eliminate email delays due to "after 220 greeting" protocol tests, which otherwise require that a client reconnects before it can deliver mail. Some providers such as Google don't retry from the same IP address, and that can result in large email delivery delays. - The recipient_delimiter feature now supports different delimiters, for example both "+" and "-". As before, this implementation recognizes exactly one delimiter character per email address, and exactly one address extension per email address. - Advanced master.cf query/update support to access service attributes as "name = value" pairs. For example to turn off chroot on all services use "postconf -F '*/*/chroot = n'", and to change/add a "-o name=value" setting use "postconf -P 'smtp/inet/name = value'". This was developed primarily to allow automated tools to manage Postfix systems without having to parse Postfix configuration files. @ text @d198 1 a198 1 reject forged domain name in Message-ID: header: $1 d212 1 a212 1 reject forged domain name in Message-ID: header: $1 d269 1 a269 1 canonical_maps = hash:/etc/postfix/canonical @ 1.1.1.4.26.1 log @Pull up the following, requeste by kim in ticket #1779: external/ibm-public/postfix/dist/README_FILES/BDAT_README up to 1.1.1.2 external/ibm-public/postfix/dist/README_FILES/MAILLOG_README up to 1.1.1.4 external/ibm-public/postfix/dist/README_FILES/POSTSCREEN_3_5_README up to 1.1.1.1 external/ibm-public/postfix/dist/html/BDAT_README.html up to 1.1.1.3 external/ibm-public/postfix/dist/html/MAILLOG_README.html up to 1.1.1.4 external/ibm-public/postfix/dist/html/makedefs.1.html up to 1.1.1.3 external/ibm-public/postfix/dist/html/postlogd.8.html up to 1.1.1.3 external/ibm-public/postfix/dist/html/POSTSCREEN_3_5_README.html up to 1.1.1.2 external/ibm-public/postfix/dist/html/postfix-doc.css up to 1.1.1.1 external/ibm-public/postfix/dist/man/man1/makedefs.1 up to 1.3 external/ibm-public/postfix/dist/man/man8/postlogd.8 up to 1.3 external/ibm-public/postfix/dist/mantools/missing-proxy-read-maps up to 1.1.1.3 external/ibm-public/postfix/dist/mantools/spelldiff up to 1.1.1.1 external/ibm-public/postfix/dist/mantools/check-double-cc up to 1.1.1.2 external/ibm-public/postfix/dist/mantools/check-double-install-proto-text up to 1.1.1.2 external/ibm-public/postfix/dist/mantools/check-double-proto-html up to 1.1.1.2 external/ibm-public/postfix/dist/mantools/comment.c up to 1.2 external/ibm-public/postfix/dist/mantools/check-postfix-files up to 1.1.1.2 external/ibm-public/postfix/dist/mantools/check-spell-cc up to 1.1.1.2 external/ibm-public/postfix/dist/mantools/check-spell-install-proto-text up to 1.1.1.2 external/ibm-public/postfix/dist/mantools/check-spell-proto-html up to 1.1.1.2 external/ibm-public/postfix/dist/mantools/deroff up to 1.1.1.1 external/ibm-public/postfix/dist/mantools/find-double up to 1.1.1.1 external/ibm-public/postfix/dist/mantools/check-double-history up to 1.1.1.1 external/ibm-public/postfix/dist/mantools/check-spell-history up to 1.1.1.1 external/ibm-public/postfix/dist/mantools/check-table-proto up to 1.1.1.1 external/ibm-public/postfix/dist/proto/BDAT_README.html up to 1.1.1.3 external/ibm-public/postfix/dist/proto/MAILLOG_README.html up to 1.1.1.4 external/ibm-public/postfix/dist/proto/POSTSCREEN_3_5_README.html up to 1.1.1.2 external/ibm-public/postfix/dist/proto/stop.double-cc up to 1.1.1.2 external/ibm-public/postfix/dist/proto/stop.double-install-proto-text up to 1.1.1.1 external/ibm-public/postfix/dist/proto/stop.double-proto-html up to 1.1.1.2 external/ibm-public/postfix/dist/proto/stop.spell-cc up to 1.1.1.2 external/ibm-public/postfix/dist/proto/stop.spell-proto-html up to 1.1.1.2 external/ibm-public/postfix/dist/proto/stop.double-history up to 1.1.1.1 external/ibm-public/postfix/dist/proto/stop.spell-history up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/bounce_notify_util_tester.c up to 1.2 external/ibm-public/postfix/dist/src/bounce/logfile-no-msgid-no-eoh-event up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/logfile-no-msgid-with-eoh-event up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/logfile-with-msgid-no-eoh-event up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/logfile-with-msgid-with-eoh-event up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/logfile-with-msgid-with-filter up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/logfile-with-msgid-with-long-line up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/msgfile-no-msgid-no-eoh-event up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/msgfile-no-msgid-with-eoh-event up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/msgfile-with-msgid-no-eoh-event up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/msgfile-with-msgid-with-eoh-event up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/obs_template_test.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/msgfile-with-msgid-with-filter up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/msgfile-with-msgid-with-long-line up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/no-msgid-no-eoh-event-no-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/no-msgid-no-eoh-event-with-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/no-msgid-with-eoh-event-no-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/no-msgid-with-eoh-event-with-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/with-msgid-no-eoh-event-no-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/with-msgid-no-eoh-event-with-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/with-msgid-with-eoh-event-no-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/with-msgid-with-eoh-event-with-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/with-msgid-with-filter-no-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/with-msgid-with-filter-with-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/with-msgid-with-long-line-no-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/bounce/with-msgid-with-long-line-with-thread.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in13e up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in13f up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in13g up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in13h up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in13i up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref13e up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref13f up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref13g up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref13h up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref13i up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/test-queue-file13e up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/test-queue-file13f up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/test-queue-file13g up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/test-queue-file13h up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/test-queue-file13i up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in17a up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in17b up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in17c up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in17d up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in17e up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in17f up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.in17g up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref17a1 up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref17a2 up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref17b1 up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref17b2 up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref17c1 up to 1.1.1.1 external/ibm-public/postfix/dist/src/cleanup/cleanup_milter.ref17c2 up to 1.1.1.1 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external/ibm-public/postfix/dist/src/global/info_log_addr_form.c up to 1.2 external/ibm-public/postfix/dist/src/global/info_log_addr_form.h up to 1.2 external/ibm-public/postfix/dist/src/global/mail_addr_crunch.in up to 1.1.1.1 external/ibm-public/postfix/dist/src/global/mail_addr_crunch.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/global/mail_addr_find.in up to 1.1.1.1 external/ibm-public/postfix/dist/src/global/map_search.c up to 1.4 external/ibm-public/postfix/dist/src/global/map_search.h up to 1.2 external/ibm-public/postfix/dist/src/global/mail_addr_find.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/global/mail_addr_form.c up to 1.2 external/ibm-public/postfix/dist/src/global/mail_addr_form.h up to 1.2 external/ibm-public/postfix/dist/src/global/mail_addr_map.ref up to 1.1.1.1 external/ibm-public/postfix/dist/src/global/maillog_client.c up to 1.3 external/ibm-public/postfix/dist/src/global/maillog_client.h up to 1.2 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external/ibm-public/postfix/dist/README_FILES/ADDRESS_VERIFICATION_README up to 1.10 external/ibm-public/postfix/dist/README_FILES/BACKSCATTER_README up to 1.1.1.5 external/ibm-public/postfix/dist/README_FILES/BASIC_CONFIGURATION_README up to 1.1.1.6 external/ibm-public/postfix/dist/README_FILES/BUILTIN_FILTER_README up to 1.1.1.3 external/ibm-public/postfix/dist/README_FILES/COMPATIBILITY_README up to 1.1.1.3 external/ibm-public/postfix/dist/README_FILES/CONNECTION_CACHE_README up to 1.1.1.5 external/ibm-public/postfix/dist/README_FILES/DATABASE_README up to 1.1.1.9 external/ibm-public/postfix/dist/README_FILES/DB_README up to 1.1.1.3 external/ibm-public/postfix/dist/README_FILES/DEBUG_README up to 1.1.1.5 external/ibm-public/postfix/dist/README_FILES/FILTER_README up to 1.1.1.4 external/ibm-public/postfix/dist/README_FILES/FORWARD_SECRECY_README up to 1.1.1.5 external/ibm-public/postfix/dist/README_FILES/INSTALL up to 1.10 external/ibm-public/postfix/dist/README_FILES/IPV6_README up to 1.1.1.4 external/ibm-public/postfix/dist/README_FILES/LDAP_README up to 1.1.1.4 external/ibm-public/postfix/dist/README_FILES/LINUX_README up to 1.1.1.3 external/ibm-public/postfix/dist/README_FILES/LMDB_README up to 1.1.1.3 external/ibm-public/postfix/dist/README_FILES/MILTER_README up to 1.1.1.9 external/ibm-public/postfix/dist/README_FILES/MULTI_INSTANCE_README up to 1.1.1.7 external/ibm-public/postfix/dist/README_FILES/MYSQL_README up to 1.1.1.5 external/ibm-public/postfix/dist/README_FILES/OVERVIEW up to 1.1.1.5 external/ibm-public/postfix/dist/README_FILES/PCRE_README up to 1.1.1.3 external/ibm-public/postfix/dist/README_FILES/PGSQL_README up to 1.1.1.4 external/ibm-public/postfix/dist/README_FILES/POSTSCREEN_README up to 1.1.1.7 external/ibm-public/postfix/dist/README_FILES/QSHAPE_README up to 1.1.1.4 external/ibm-public/postfix/dist/README_FILES/RELEASE_NOTES up to 1.1.1.17 external/ibm-public/postfix/dist/README_FILES/SASL_README up to 1.1.1.11 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external/ibm-public/postfix/dist/src/master/Makefile.in up to 1.1.1.7 external/ibm-public/postfix/dist/src/master/event_server.c up to 1.4 external/ibm-public/postfix/dist/src/master/mail_server.h up to 1.4 external/ibm-public/postfix/dist/src/master/master.c up to 1.4 external/ibm-public/postfix/dist/src/master/master.h up to 1.2 external/ibm-public/postfix/dist/src/master/master_conf.c up to 1.2 external/ibm-public/postfix/dist/src/master/master_ent.c up to 1.4 external/ibm-public/postfix/dist/src/master/master_listen.c up to 1.2 external/ibm-public/postfix/dist/src/master/master_monitor.c up to 1.3 external/ibm-public/postfix/dist/src/master/master_proto.h up to 1.2 external/ibm-public/postfix/dist/src/master/master_sig.c up to 1.3 external/ibm-public/postfix/dist/src/master/master_spawn.c up to 1.3 external/ibm-public/postfix/dist/src/master/master_vars.c up to 1.3 external/ibm-public/postfix/dist/src/master/master_wakeup.c up to 1.3 external/ibm-public/postfix/dist/src/master/multi_server.c up to 1.4 external/ibm-public/postfix/dist/src/master/single_server.c up to 1.4 external/ibm-public/postfix/dist/src/master/trigger_server.c up to 1.4 external/ibm-public/postfix/dist/src/milter/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/milter/milter.c up to 1.5 external/ibm-public/postfix/dist/src/milter/milter.h up to 1.4 external/ibm-public/postfix/dist/src/milter/milter8.c up to 1.5 external/ibm-public/postfix/dist/src/milter/milter_macros.c up to 1.3 external/ibm-public/postfix/dist/src/milter/test-milter.c up to 1.3 external/ibm-public/postfix/dist/src/oqmgr/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/oqmgr/qmgr.c up to 1.3 external/ibm-public/postfix/dist/src/oqmgr/qmgr.h up to 1.3 external/ibm-public/postfix/dist/src/oqmgr/qmgr_active.c up to 1.3 external/ibm-public/postfix/dist/src/oqmgr/qmgr_deliver.c up to 1.3 external/ibm-public/postfix/dist/src/oqmgr/qmgr_entry.c up to 1.3 external/ibm-public/postfix/dist/src/oqmgr/qmgr_error.c up to 1.2 external/ibm-public/postfix/dist/src/oqmgr/qmgr_feedback.c up to 1.2 external/ibm-public/postfix/dist/src/oqmgr/qmgr_message.c up to 1.4 external/ibm-public/postfix/dist/src/pickup/Makefile.in up to 1.1.1.3 external/ibm-public/postfix/dist/src/pickup/pickup.c up to 1.4 external/ibm-public/postfix/dist/src/pipe/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/pipe/pipe.c up to 1.4 external/ibm-public/postfix/dist/src/postalias/Makefile.in up to 1.1.1.6 external/ibm-public/postfix/dist/src/postalias/fail_test.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/postalias/fail_test.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postalias/postalias.c up to 1.5 external/ibm-public/postfix/dist/src/postcat/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/postcat/postcat.c up to 1.4 external/ibm-public/postfix/dist/src/postconf/Makefile.in up to 1.1.1.11 external/ibm-public/postfix/dist/src/postconf/extract.awk up to 1.1.1.6 external/ibm-public/postfix/dist/src/postconf/install_vars.h up to 1.2 external/ibm-public/postfix/dist/src/postconf/postconf.c up to 1.4 external/ibm-public/postfix/dist/src/postconf/postconf.h up to 1.4 external/ibm-public/postfix/dist/src/postconf/postconf_builtin.c up to 1.4 external/ibm-public/postfix/dist/src/postconf/postconf_dbms.c up to 1.5 external/ibm-public/postfix/dist/src/postconf/postconf_edit.c up to 1.3 external/ibm-public/postfix/dist/src/postconf/postconf_lookup.c up to 1.4 external/ibm-public/postfix/dist/src/postconf/postconf_main.c up to 1.4 external/ibm-public/postfix/dist/src/postconf/postconf_master.c up to 1.8 external/ibm-public/postfix/dist/src/postconf/postconf_misc.c up to 1.3 external/ibm-public/postfix/dist/src/postconf/postconf_user.c up to 1.4 external/ibm-public/postfix/dist/src/postconf/test28.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/postconf/test29.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/postconf/test34.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postconf/test35.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postconf/test40.ref up to 1.1.1.4 external/ibm-public/postfix/dist/src/postconf/test41.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postconf/test42.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postconf/test43.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postconf/test44.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postconf/test58.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/postconf/test59.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/postdrop/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/postdrop/postdrop.c up to 1.4 external/ibm-public/postfix/dist/src/postfix/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/postfix/postfix.c up to 1.6 external/ibm-public/postfix/dist/src/postkick/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/postkick/postkick.c up to 1.4 external/ibm-public/postfix/dist/src/postlock/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/postlock/postlock.c up to 1.4 external/ibm-public/postfix/dist/src/postlog/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/postlog/postlog.c up to 1.5 external/ibm-public/postfix/dist/src/postmap/Makefile.in up to 1.1.1.7 external/ibm-public/postfix/dist/src/postmap/fail_test.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/postmap/fail_test.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/postmap/postmap.c up to 1.5 external/ibm-public/postfix/dist/src/postmulti/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/postmulti/postmulti.c up to 1.4 external/ibm-public/postfix/dist/src/postqueue/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/postqueue/postqueue.c up to 1.5 external/ibm-public/postfix/dist/src/postqueue/showq_compat.c up to 1.4 external/ibm-public/postfix/dist/src/postqueue/showq_json.c up to 1.4 external/ibm-public/postfix/dist/src/postscreen/Makefile.in up to 1.1.1.7 external/ibm-public/postfix/dist/src/postscreen/postscreen.c up to 1.5 external/ibm-public/postfix/dist/src/postscreen/postscreen.h up to 1.4 external/ibm-public/postfix/dist/src/postscreen/postscreen_dnsbl.c up to 1.4 external/ibm-public/postfix/dist/src/postscreen/postscreen_early.c up to 1.4 external/ibm-public/postfix/dist/src/postscreen/postscreen_endpt.c up to 1.4 external/ibm-public/postfix/dist/src/postscreen/postscreen_haproxy.c up to 1.3 external/ibm-public/postfix/dist/src/postscreen/postscreen_haproxy.h up to 1.2 external/ibm-public/postfix/dist/src/postscreen/postscreen_misc.c up to 1.4 external/ibm-public/postfix/dist/src/postscreen/postscreen_send.c up to 1.3 external/ibm-public/postfix/dist/src/postscreen/postscreen_smtpd.c up to 1.5 external/ibm-public/postfix/dist/src/postscreen/postscreen_starttls.c up to 1.4 external/ibm-public/postfix/dist/src/postscreen/postscreen_state.c up to 1.4 external/ibm-public/postfix/dist/src/postscreen/postscreen_tests.c up to 1.4 external/ibm-public/postfix/dist/src/postsuper/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/postsuper/postsuper.c up to 1.4 external/ibm-public/postfix/dist/src/posttls-finger/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/posttls-finger/posttls-finger.c up to 1.5 external/ibm-public/postfix/dist/src/proxymap/Makefile.in up to 1.1.1.6 external/ibm-public/postfix/dist/src/proxymap/proxymap.c up to 1.4 external/ibm-public/postfix/dist/src/qmgr/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/qmgr/qmgr.c up to 1.3 external/ibm-public/postfix/dist/src/qmgr/qmgr.h up to 1.3 external/ibm-public/postfix/dist/src/qmgr/qmgr_active.c up to 1.3 external/ibm-public/postfix/dist/src/qmgr/qmgr_deliver.c up to 1.3 external/ibm-public/postfix/dist/src/qmgr/qmgr_entry.c up to 1.3 external/ibm-public/postfix/dist/src/qmgr/qmgr_error.c up to 1.2 external/ibm-public/postfix/dist/src/qmgr/qmgr_feedback.c up to 1.2 external/ibm-public/postfix/dist/src/qmgr/qmgr_message.c up to 1.4 external/ibm-public/postfix/dist/src/qmqpd/Makefile.in up to 1.1.1.6 external/ibm-public/postfix/dist/src/qmqpd/qmqpd.c up to 1.4 external/ibm-public/postfix/dist/src/qmqpd/qmqpd_peer.c up to 1.3 external/ibm-public/postfix/dist/src/scache/Makefile.in up to 1.1.1.3 external/ibm-public/postfix/dist/src/scache/scache.c up to 1.4 external/ibm-public/postfix/dist/src/sendmail/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/sendmail/sendmail.c up to 1.4 external/ibm-public/postfix/dist/src/showq/Makefile.in up to 1.1.1.3 external/ibm-public/postfix/dist/src/showq/showq.c up to 1.5 external/ibm-public/postfix/dist/src/smtp/Makefile.in up to 1.1.1.10 external/ibm-public/postfix/dist/src/smtp/lmtp_params.c up to 1.5 external/ibm-public/postfix/dist/src/smtp/smtp.c up to 1.13 external/ibm-public/postfix/dist/src/smtp/smtp.h up to 1.5 external/ibm-public/postfix/dist/src/smtp/smtp_addr.c up to 1.5 external/ibm-public/postfix/dist/src/smtp/smtp_addr.h up to 1.3 external/ibm-public/postfix/dist/src/smtp/smtp_chat.c up to 1.4 external/ibm-public/postfix/dist/src/smtp/smtp_connect.c up to 1.5 external/ibm-public/postfix/dist/src/smtp/smtp_key.c up to 1.3 external/ibm-public/postfix/dist/src/smtp/smtp_map11.c up to 1.3 external/ibm-public/postfix/dist/src/smtp/smtp_map11.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtp/smtp_params.c up to 1.5 external/ibm-public/postfix/dist/src/smtp/smtp_proto.c up to 1.5 external/ibm-public/postfix/dist/src/smtp/smtp_rcpt.c up to 1.3 external/ibm-public/postfix/dist/src/smtp/smtp_reuse.c up to 1.4 external/ibm-public/postfix/dist/src/smtp/smtp_sasl_auth_cache.c up to 1.3 external/ibm-public/postfix/dist/src/smtp/smtp_sasl_glue.c up to 1.3 external/ibm-public/postfix/dist/src/smtp/smtp_sasl_proto.c up to 1.3 external/ibm-public/postfix/dist/src/smtp/smtp_session.c up to 1.5 external/ibm-public/postfix/dist/src/smtp/smtp_state.c up to 1.3 external/ibm-public/postfix/dist/src/smtp/smtp_tls_policy.c up to 1.4 external/ibm-public/postfix/dist/src/smtp/smtp_trouble.c up to 1.3 external/ibm-public/postfix/dist/src/smtpd/Makefile.in up to 1.1.1.11 external/ibm-public/postfix/dist/src/smtpd/pfilter.c up to 1.2 (+patch) external/ibm-public/postfix/dist/src/smtpd/smtpd.c up to 1.20 external/ibm-public/postfix/dist/src/smtpd/smtpd.h up to 1.5 external/ibm-public/postfix/dist/src/smtpd/smtpd_acl.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtpd/smtpd_acl.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtpd/smtpd_chat.c up to 1.4 external/ibm-public/postfix/dist/src/smtpd/smtpd_chat.h up to 1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_check.c up to 1.6 external/ibm-public/postfix/dist/src/smtpd/smtpd_check.h up to 1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_check.in up to 1.1.1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_check.in2 up to 1.1.1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_check.in3 up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtpd/smtpd_check.ref up to 1.1.1.5 external/ibm-public/postfix/dist/src/smtpd/smtpd_check.ref2 up to 1.1.1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_check_backup.in up to 1.1.1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_check_backup.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_check_dsn.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtpd/smtpd_check_dsn.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtpd/smtpd_dns_filter.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtpd/smtpd_dnswl.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/smtpd/smtpd_dnswl.ref up to 1.1.1.4 external/ibm-public/postfix/dist/src/smtpd/smtpd_error.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtpd/smtpd_error.ref up to 1.1.1.4 external/ibm-public/postfix/dist/src/smtpd/smtpd_exp.in up to 1.1.1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_exp.ref up to 1.1.1.5 external/ibm-public/postfix/dist/src/smtpd/smtpd_expand.h up to 1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_haproxy.c up to 1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_milter.c up to 1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_nullmx.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtpd/smtpd_nullmx.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/smtpd/smtpd_peer.c up to 1.5 external/ibm-public/postfix/dist/src/smtpd/smtpd_proxy.c up to 1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_resolve.c up to 1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_resolve.h up to 1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_sasl_glue.c up to 1.5 external/ibm-public/postfix/dist/src/smtpd/smtpd_sasl_proto.c up to 1.3 external/ibm-public/postfix/dist/src/smtpd/smtpd_server.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/smtpd/smtpd_server.ref up to 1.1.1.4 external/ibm-public/postfix/dist/src/smtpd/smtpd_state.c up to 1.2 external/ibm-public/postfix/dist/src/smtpstone/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/smtpstone/smtp-sink.c up to 1.3 external/ibm-public/postfix/dist/src/smtpstone/smtp-source.c up to 1.3 external/ibm-public/postfix/dist/src/spawn/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/spawn/spawn.c up to 1.4 external/ibm-public/postfix/dist/src/tls/Makefile.in up to 1.1.1.10 external/ibm-public/postfix/dist/src/tls/tls.h up to 1.5 external/ibm-public/postfix/dist/src/tls/tls_bio_ops.c up to 1.1.1.6 external/ibm-public/postfix/dist/src/tls/tls_certkey.c up to 1.4 external/ibm-public/postfix/dist/src/tls/tls_client.c up to 1.13 external/ibm-public/postfix/dist/src/tls/tls_dane.c up to 1.5 external/ibm-public/postfix/dist/src/tls/tls_dh.c up to 1.5 external/ibm-public/postfix/dist/src/tls/tls_fprint.c up to 1.4 external/ibm-public/postfix/dist/src/tls/tls_mgr.c up to 1.4 external/ibm-public/postfix/dist/src/tls/tls_misc.c up to 1.5 external/ibm-public/postfix/dist/src/tls/tls_proxy.h up to 1.4 external/ibm-public/postfix/dist/src/tls/tls_proxy_clnt.c up to 1.4 external/ibm-public/postfix/dist/src/tls/tls_rsa.c up to 1.4 external/ibm-public/postfix/dist/src/tls/tls_scache.c up to 1.4 external/ibm-public/postfix/dist/src/tls/tls_server.c up to 1.12 external/ibm-public/postfix/dist/src/tls/tls_session.c up to 1.3 external/ibm-public/postfix/dist/src/tls/tls_verify.c up to 1.4 external/ibm-public/postfix/dist/src/tlsmgr/Makefile.in up to 1.1.1.6 external/ibm-public/postfix/dist/src/tlsmgr/tlsmgr.c up to 1.4 external/ibm-public/postfix/dist/src/tlsproxy/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/tlsproxy/tlsproxy.c up to 1.6 external/ibm-public/postfix/dist/src/tlsproxy/tlsproxy.h up to 1.2 external/ibm-public/postfix/dist/src/tlsproxy/tlsproxy_state.c up to 1.3 external/ibm-public/postfix/dist/src/trivial-rewrite/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/trivial-rewrite/resolve.c up to 1.4 external/ibm-public/postfix/dist/src/trivial-rewrite/rewrite.c up to 1.3 external/ibm-public/postfix/dist/src/trivial-rewrite/transport.c up to 1.4 external/ibm-public/postfix/dist/src/trivial-rewrite/trivial-rewrite.c up to 1.4 external/ibm-public/postfix/dist/src/trivial-rewrite/trivial-rewrite.h up to 1.3 external/ibm-public/postfix/dist/src/util/Makefile.in up to 1.1.1.11 external/ibm-public/postfix/dist/src/util/allascii.c up to 1.3 external/ibm-public/postfix/dist/src/util/alldig.c up to 1.2 external/ibm-public/postfix/dist/src/util/argv.c up to 1.4 external/ibm-public/postfix/dist/src/util/argv.h up to 1.4 external/ibm-public/postfix/dist/src/util/attr.h up to 1.5 external/ibm-public/postfix/dist/src/util/attr_clnt.c up to 1.3 external/ibm-public/postfix/dist/src/util/attr_clnt.h up to 1.3 external/ibm-public/postfix/dist/src/util/attr_print0.c up to 1.3 external/ibm-public/postfix/dist/src/util/attr_print64.c up to 1.3 external/ibm-public/postfix/dist/src/util/attr_print_plain.c up to 1.3 external/ibm-public/postfix/dist/src/util/attr_scan0.c up to 1.3 external/ibm-public/postfix/dist/src/util/attr_scan0.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/util/attr_scan64.c up to 1.3 external/ibm-public/postfix/dist/src/util/attr_scan64.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/util/attr_scan_plain.c up to 1.3 external/ibm-public/postfix/dist/src/util/attr_scan_plain.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/util/auto_clnt.c up to 1.4 external/ibm-public/postfix/dist/src/util/auto_clnt.h up to 1.2 external/ibm-public/postfix/dist/src/util/base32_code.h up to 1.3 external/ibm-public/postfix/dist/src/util/base64_code.h up to 1.3 external/ibm-public/postfix/dist/src/util/binhash.c up to 1.3 external/ibm-public/postfix/dist/src/util/binhash.h up to 1.3 external/ibm-public/postfix/dist/src/util/casefold.c up to 1.3 external/ibm-public/postfix/dist/src/util/check_arg.h up to 1.3 external/ibm-public/postfix/dist/src/util/cidr_match.c up to 1.4 external/ibm-public/postfix/dist/src/util/cidr_match.h up to 1.2 external/ibm-public/postfix/dist/src/util/clean_env.c up to 1.3 external/ibm-public/postfix/dist/src/util/clean_env.h up to 1.2 external/ibm-public/postfix/dist/src/util/connect.h up to 1.2 external/ibm-public/postfix/dist/src/util/dict.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict.h up to 1.5 external/ibm-public/postfix/dist/src/util/dict_alloc.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_cache.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_cdb.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_cdb.h up to 1.2 external/ibm-public/postfix/dist/src/util/dict_cidr.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_cidr.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/dict_cidr.map up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/dict_cidr.ref up to 1.1.1.4 external/ibm-public/postfix/dist/src/util/dict_db.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_db.h up to 1.4 external/ibm-public/postfix/dist/src/util/dict_dbm.h up to 1.2 external/ibm-public/postfix/dist/src/util/dict_fail.c up to 1.2 external/ibm-public/postfix/dist/src/util/dict_fail.h up to 1.2 external/ibm-public/postfix/dist/src/util/dict_inline.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_lmdb.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_lmdb.h up to 1.3 external/ibm-public/postfix/dist/src/util/dict_open.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_pcre.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_pcre.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/dict_pcre.map up to 1.1.1.3 external/ibm-public/postfix/dist/src/util/dict_pcre.ref up to 1.1.1.4 external/ibm-public/postfix/dist/src/util/dict_random.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_random.h up to 1.3 external/ibm-public/postfix/dist/src/util/dict_regexp.c up to 1.5 external/ibm-public/postfix/dist/src/util/dict_regexp.map up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/dict_regexp.ref up to 1.1.1.3 external/ibm-public/postfix/dist/src/util/dict_sdbm.h up to 1.2 external/ibm-public/postfix/dist/src/util/dict_static.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_thash.c up to 1.4 external/ibm-public/postfix/dist/src/util/dict_thash.map up to 1.1.1.3 external/ibm-public/postfix/dist/src/util/dict_union.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_utf8.c up to 1.3 external/ibm-public/postfix/dist/src/util/dict_utf8_test.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/dup2_pass_on_exec.c up to 1.2 external/ibm-public/postfix/dist/src/util/edit_file.c up to 1.4 external/ibm-public/postfix/dist/src/util/edit_file.h up to 1.3 external/ibm-public/postfix/dist/src/util/extpar.c up to 1.4 external/ibm-public/postfix/dist/src/util/find_inet.c up to 1.3 external/ibm-public/postfix/dist/src/util/gccw.c up to 1.2 external/ibm-public/postfix/dist/src/util/hex_code.c up to 1.3 external/ibm-public/postfix/dist/src/util/hex_code.h up to 1.4 external/ibm-public/postfix/dist/src/util/hex_quote.c up to 1.2 external/ibm-public/postfix/dist/src/util/host_port.h up to 1.3 external/ibm-public/postfix/dist/src/util/htable.c up to 1.4 external/ibm-public/postfix/dist/src/util/inet_addr_host.c up to 1.3 external/ibm-public/postfix/dist/src/util/inet_addr_list.in up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/inet_addr_list.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/inet_connect.c up to 1.3 external/ibm-public/postfix/dist/src/util/inet_listen.c up to 1.3 external/ibm-public/postfix/dist/src/util/inet_proto.c up to 1.4 external/ibm-public/postfix/dist/src/util/inet_proto.h up to 1.2 external/ibm-public/postfix/dist/src/util/killme_after.c up to 1.2 external/ibm-public/postfix/dist/src/util/listen.h up to 1.3 external/ibm-public/postfix/dist/src/util/load_lib.c up to 1.3 external/ibm-public/postfix/dist/src/util/lstat_as.h up to 1.3 external/ibm-public/postfix/dist/src/util/mac_expand.c up to 1.4 external/ibm-public/postfix/dist/src/util/mac_expand.h up to 1.4 external/ibm-public/postfix/dist/src/util/mac_expand.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/util/mac_expand.ref up to 1.1.1.4 external/ibm-public/postfix/dist/src/util/mac_parse.h up to 1.3 external/ibm-public/postfix/dist/src/util/make_dirs.c up to 1.2 external/ibm-public/postfix/dist/src/util/match_list.c up to 1.3 external/ibm-public/postfix/dist/src/util/match_ops.c up to 1.3 external/ibm-public/postfix/dist/src/util/midna_domain.c up to 1.4 external/ibm-public/postfix/dist/src/util/midna_domain.h up to 1.4 external/ibm-public/postfix/dist/src/util/midna_domain_test.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/msg_output.c up to 1.4 external/ibm-public/postfix/dist/src/util/msg_output.h up to 1.3 external/ibm-public/postfix/dist/src/util/msg_syslog.c up to 1.2 external/ibm-public/postfix/dist/src/util/msg_syslog.h up to 1.3 external/ibm-public/postfix/dist/src/util/mvect.c up to 1.3 external/ibm-public/postfix/dist/src/util/myaddrinfo.c up to 1.3 external/ibm-public/postfix/dist/src/util/myaddrinfo.h up to 1.3 external/ibm-public/postfix/dist/src/util/myaddrinfo.ref up to 1.1.1.5 external/ibm-public/postfix/dist/src/util/myaddrinfo4.ref up to 1.1.1.2 external/ibm-public/postfix/dist/src/util/myflock.c up to 1.3 external/ibm-public/postfix/dist/src/util/myflock.h up to 1.3 external/ibm-public/postfix/dist/src/util/mymalloc.c up to 1.4 external/ibm-public/postfix/dist/src/util/mymalloc.h up to 1.4 external/ibm-public/postfix/dist/src/util/mystrtok.c up to 1.4 external/ibm-public/postfix/dist/src/util/name_mask.c up to 1.3 external/ibm-public/postfix/dist/src/util/nbbio.c up to 1.3 external/ibm-public/postfix/dist/src/util/netstring.c up to 1.3 external/ibm-public/postfix/dist/src/util/peekfd.c up to 1.3 external/ibm-public/postfix/dist/src/util/printable.c up to 1.3 external/ibm-public/postfix/dist/src/util/recv_pass_attr.c up to 1.3 external/ibm-public/postfix/dist/src/util/sane_fsops.h up to 1.3 external/ibm-public/postfix/dist/src/util/sane_link.c up to 1.2 external/ibm-public/postfix/dist/src/util/sane_rename.c up to 1.2 external/ibm-public/postfix/dist/src/util/sane_socketpair.h up to 1.3 external/ibm-public/postfix/dist/src/util/slmdb.c up to 1.4 external/ibm-public/postfix/dist/src/util/sock_addr.c up to 1.3 external/ibm-public/postfix/dist/src/util/sock_addr.h up to 1.2 external/ibm-public/postfix/dist/src/util/split_nameval.c up to 1.2 external/ibm-public/postfix/dist/src/util/stat_as.h up to 1.3 external/ibm-public/postfix/dist/src/util/stringops.h up to 1.5 external/ibm-public/postfix/dist/src/util/sys_compat.c up to 1.3 external/ibm-public/postfix/dist/src/util/sys_defs.h up to 1.14 external/ibm-public/postfix/dist/src/util/timed_wait.h up to 1.3 external/ibm-public/postfix/dist/src/util/unix_pass_fd_fix.c up to 1.2 external/ibm-public/postfix/dist/src/util/unix_send_fd.c up to 1.8 external/ibm-public/postfix/dist/src/util/unsafe.c up to 1.2 external/ibm-public/postfix/dist/src/util/valid_hostname.c up to 1.3 external/ibm-public/postfix/dist/src/util/valid_hostname.h up to 1.2 external/ibm-public/postfix/dist/src/util/vbuf.c up to 1.3 external/ibm-public/postfix/dist/src/util/vbuf_print.c up to 1.4 external/ibm-public/postfix/dist/src/util/vstream.c up to 1.4 external/ibm-public/postfix/dist/src/util/vstream.h up to 1.4 external/ibm-public/postfix/dist/src/util/vstream_tweak.c up to 1.3 external/ibm-public/postfix/dist/src/util/vstring.c up to 1.4 external/ibm-public/postfix/dist/src/util/vstring.h up to 1.4 external/ibm-public/postfix/dist/src/util/vstring_vstream.c up to 1.2 external/ibm-public/postfix/dist/src/util/vstring_vstream.h up to 1.3 external/ibm-public/postfix/dist/src/util/watchdog.c up to 1.3 external/ibm-public/postfix/dist/src/verify/Makefile.in up to 1.1.1.6 external/ibm-public/postfix/dist/src/verify/verify.c up to 1.4 external/ibm-public/postfix/dist/src/virtual/Makefile.in up to 1.1.1.5 external/ibm-public/postfix/dist/src/virtual/mailbox.c up to 1.3 external/ibm-public/postfix/dist/src/virtual/virtual.c up to 1.4 external/ibm-public/postfix/dist/src/xsasl/Makefile.in up to 1.1.1.4 external/ibm-public/postfix/dist/src/xsasl/xsasl.h up to 1.3 external/ibm-public/postfix/dist/src/xsasl/xsasl_cyrus_client.c up to 1.3 external/ibm-public/postfix/dist/src/xsasl/xsasl_cyrus_server.c up to 1.4 external/ibm-public/postfix/dist/src/xsasl/xsasl_dovecot_server.c up to 1.4 external/ibm-public/postfix/dist/src/xsasl/xsasl_saslc_client.c up to 1.2 external/ibm-public/postfix/dist/src/xsasl/xsasl_server.c up to 1.2 external/ibm-public/postfix/lib/dns/Makefile up to 1.4 external/ibm-public/postfix/lib/global/Makefile up to 1.10 external/ibm-public/postfix/lib/masterlib/Makefile up to 1.3 external/ibm-public/postfix/lib/milter/Makefile up to 1.2 external/ibm-public/postfix/lib/tls/Makefile up to 1.4 external/ibm-public/postfix/lib/util/Makefile up to 1.11 external/ibm-public/postfix/lib/xsasl/Makefile up to 1.3 external/ibm-public/postfix/libexec/smtp/Makefile up to 1.4 external/ibm-public/postfix/libexec/smtpd/Makefile up to 1.9 (+patch) external/ibm-public/postfix/libexec/tlsproxy/Makefile up to 1.2 external/ibm-public/postfix/sbin/postconf/Makefile up to 1.9 doc/3RDPARTY (apply patch) Update Postfix to 3.8.4. @ text @d10 1 a10 2 d305 1 a305 1 If you have such clients then you can exclude their Message-ID
d385 1
a385 2
notification email, see
https://web.archive.org/web/20100317123907/http://std.dkuug.dk/keld/virus/
@
1.1.1.5
log
@Import Postfix-3.7.3 (previous version was 3.5.2)
This is the Postfix 3.7 (stable) release.
The stable Postfix release is called postfix-3.7.x where 3=major
release number, 7=minor release number, x=patchlevel. The stable
release never changes except for patches that address bugs or
emergencies. Patches change the patchlevel and the release date.
New features are developed in snapshot releases. These are called
postfix-3.8-yyyymmdd where yyyymmdd is the release date (yyyy=year,
mm=month, dd=day). Patches are never issued for snapshot releases;
instead, a new snapshot is released.
The mail_release_date configuration parameter (format: yyyymmdd)
specifies the release date of a stable release or snapshot release.
If you upgrade from Postfix 3.5 or earlier, read RELEASE_NOTES-3.6
before proceeding.
License change
---------------
This software is distributed with a dual license: in addition to the
historical IBM Public License 1.0, it is now also distributed with the
more recent Eclipse Public License 2.0. Recipients can choose to take
the software under the license of their choice. Those who are more
comfortable with the IPL can continue with that license.
Bugfix for messages not delivered after "warning: Unexpected record type 'X'
============================================================================
Due to a bug introduced in Postfix 3.7.0, a message could falsely
be flagged as corrupt with "warning: Unexpected record type 'X'".
Such messages were moved to the "corrupt" queue directory, where
they may still be found. See below for instructions to deal with
these falsely flagged messages.
This could happen for messages with 5000 or more recipients, or
with fewer recipients on a busy mail server. The problem was first
reported by Frank Brendel, reproduced by John Alex.
A file in the "corrupt" queue directory may be inspected with the
command "postcat /var/spool/postfix/corrupt/ If you have such clients then you can exclude their Message-ID
d385 1
a385 2
notification email, see
https://web.archive.org/web/20100317123907/http://std.dkuug.dk/keld/virus/
@
1.1.1.5.2.1
log
@Pullup the following, requested by kim in ticket #518:
external/ibm-public/postfix/dist/html/postfix-doc.css up to 1.1.1.1
external/ibm-public/postfix/dist/mantools/check-double-history up to 1.1.1.1
external/ibm-public/postfix/dist/mantools/check-spell-history up to 1.1.1.1
external/ibm-public/postfix/dist/mantools/check-table-proto up to 1.1.1.1
external/ibm-public/postfix/dist/proto/stop.double-history up to 1.1.1.1
external/ibm-public/postfix/dist/proto/stop.spell-history up to 1.1.1.1
external/ibm-public/postfix/dist/src/postconf/test71.ref up to 1.1.1.1
external/ibm-public/postfix/dist/src/util/mkmap_db.c up to 1.2
external/ibm-public/postfix/dist/src/util/mkmap.h up to 1.2
external/ibm-public/postfix/dist/src/util/inet_addr_sizes.c up to 1.2
external/ibm-public/postfix/dist/src/util/inet_addr_sizes.h up to 1.2
external/ibm-public/postfix/dist/src/util/inet_prefix_top.c up to 1.2
external/ibm-public/postfix/dist/src/util/inet_prefix_top.h up to 1.2
external/ibm-public/postfix/dist/src/util/mkmap_cdb.c up to 1.2
external/ibm-public/postfix/dist/src/util/mkmap_dbm.c up to 1.2
external/ibm-public/postfix/dist/src/util/mkmap_fail.c up to 1.2
external/ibm-public/postfix/dist/src/util/mkmap_lmdb.c up to 1.2
external/ibm-public/postfix/dist/src/util/mkmap_open.c up to 1.2
external/ibm-public/postfix/dist/src/util/mkmap_sdbm.c up to 1.2
external/ibm-public/postfix/dist/RELEASE_NOTES-3.7 up to 1.1.1.1
external/ibm-public/postfix/dist/src/global/mkmap.h delete
external/ibm-public/postfix/dist/src/global/mkmap_cdb.c delete
external/ibm-public/postfix/dist/src/global/mkmap_db.c delete
external/ibm-public/postfix/dist/src/global/mkmap_dbm.c delete
external/ibm-public/postfix/dist/src/global/mkmap_fail.c delete
external/ibm-public/postfix/dist/src/global/mkmap_lmdb.c delete
external/ibm-public/postfix/dist/src/global/mkmap_open.c delete
external/ibm-public/postfix/dist/src/global/mkmap_sdbm.c delete
external/ibm-public/postfix/dist/HISTORY up to 1.1.1.29
external/ibm-public/postfix/dist/INSTALL up to 1.1.1.9
external/ibm-public/postfix/dist/Makefile.in up to 1.1.1.10
external/ibm-public/postfix/dist/RELEASE_NOTES up to 1.1.1.17
external/ibm-public/postfix/dist/WISHLIST up to 1.1.1.2
external/ibm-public/postfix/dist/makedefs up to 1.16
external/ibm-public/postfix/dist/postfix-env.sh up to 1.1.1.2
external/ibm-public/postfix/dist/README_FILES/ADDRESS_CLASS_README up to 1.1.1.2
external/ibm-public/postfix/dist/README_FILES/BASIC_CONFIGURATION_README up to 1.1.1.6
external/ibm-public/postfix/dist/README_FILES/DEBUG_README up to 1.1.1.5
external/ibm-public/postfix/dist/README_FILES/FORWARD_SECRECY_README up to 1.1.1.5
external/ibm-public/postfix/dist/README_FILES/INSTALL up to 1.10
external/ibm-public/postfix/dist/README_FILES/IPV6_README up to 1.1.1.4
external/ibm-public/postfix/dist/README_FILES/MAILLOG_README up to 1.1.1.4
external/ibm-public/postfix/dist/README_FILES/MILTER_README up to 1.1.1.9
external/ibm-public/postfix/dist/README_FILES/MYSQL_README up to 1.1.1.5
external/ibm-public/postfix/dist/README_FILES/PGSQL_README up to 1.1.1.4
external/ibm-public/postfix/dist/README_FILES/QSHAPE_README up to 1.1.1.4
external/ibm-public/postfix/dist/README_FILES/RELEASE_NOTES up to 1.1.1.17
external/ibm-public/postfix/dist/README_FILES/SASL_README up to 1.1.1.11
external/ibm-public/postfix/dist/README_FILES/SMTPD_POLICY_README up to 1.1.1.7
external/ibm-public/postfix/dist/README_FILES/SMTPD_PROXY_README up to 1.1.1.6
external/ibm-public/postfix/dist/README_FILES/SQLITE_README up to 1.1.1.4
external/ibm-public/postfix/dist/README_FILES/STANDARD_CONFIGURATION_README up to 1.1.1.6
external/ibm-public/postfix/dist/README_FILES/TLS_README up to 1.14
external/ibm-public/postfix/dist/conf/aliases up to 1.1.1.5
external/ibm-public/postfix/dist/conf/main.cf up to 1.10
external/ibm-public/postfix/dist/conf/master.cf up to 1.11
external/ibm-public/postfix/dist/conf/postfix-files up to 1.9
external/ibm-public/postfix/dist/conf/postfix-script up to 1.4
external/ibm-public/postfix/dist/conf/postfix-tls-script up to 1.5
external/ibm-public/postfix/dist/conf/virtual up to 1.1.1.6
external/ibm-public/postfix/dist/html/ADDRESS_CLASS_README.html up to 1.1.1.3
external/ibm-public/postfix/dist/html/ADDRESS_REWRITING_README.html up to 1.1.1.6
external/ibm-public/postfix/dist/html/ADDRESS_VERIFICATION_README.html up to 1.11
external/ibm-public/postfix/dist/html/BACKSCATTER_README.html up to 1.1.1.6
external/ibm-public/postfix/dist/html/BASIC_CONFIGURATION_README.html up to 1.1.1.7
external/ibm-public/postfix/dist/html/BDAT_README.html up to 1.1.1.3
external/ibm-public/postfix/dist/html/BUILTIN_FILTER_README.html up to 1.1.1.5
external/ibm-public/postfix/dist/html/CDB_README.html up to 1.1.1.4
external/ibm-public/postfix/dist/html/COMPATIBILITY_README.html up to 1.1.1.4
external/ibm-public/postfix/dist/html/CONNECTION_CACHE_README.html up to 1.1.1.6
external/ibm-public/postfix/dist/html/CONTENT_INSPECTION_README.html up to 1.1.1.3
external/ibm-public/postfix/dist/html/DATABASE_README.html up to 1.1.1.10
external/ibm-public/postfix/dist/html/DB_README.html up to 1.1.1.4
external/ibm-public/postfix/dist/html/DEBUG_README.html up to 1.1.1.6
external/ibm-public/postfix/dist/html/DSN_README.html up to 1.1.1.3
external/ibm-public/postfix/dist/html/ETRN_README.html up to 1.1.1.4
external/ibm-public/postfix/dist/html/FILTER_README.html up to 1.1.1.5
external/ibm-public/postfix/dist/html/FORWARD_SECRECY_README.html up to 1.1.1.5
external/ibm-public/postfix/dist/html/INSTALL.html up to 1.10
external/ibm-public/postfix/dist/html/IPV6_README.html up to 1.1.1.4
external/ibm-public/postfix/dist/html/LDAP_README.html up to 1.1.1.6
external/ibm-public/postfix/dist/html/LINUX_README.html up to 1.1.1.4
external/ibm-public/postfix/dist/html/LMDB_README.html up to 1.1.1.4
external/ibm-public/postfix/dist/html/LOCAL_RECIPIENT_README.html up to 1.1.1.3
external/ibm-public/postfix/dist/html/MAILDROP_README.html up to 1.1.1.5
external/ibm-public/postfix/dist/html/MAILLOG_README.html up to 1.1.1.4
external/ibm-public/postfix/dist/html/MEMCACHE_README.html up to 1.1.1.3
external/ibm-public/postfix/dist/html/MILTER_README.html up to 1.1.1.9
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external/ibm-public/postfix/dist/src/postconf/postconf_main.c up to 1.4
external/ibm-public/postfix/dist/src/postconf/postconf_master.c up to 1.8
external/ibm-public/postfix/dist/src/postconf/postconf_misc.c up to 1.3
external/ibm-public/postfix/dist/src/postconf/test58.ref up to 1.1.1.3
external/ibm-public/postfix/dist/src/postfix/postfix.c up to 1.6
external/ibm-public/postfix/dist/src/postlog/postlog.c up to 1.5
external/ibm-public/postfix/dist/src/postlogd/Makefile.in up to 1.1.1.3
external/ibm-public/postfix/dist/src/postmap/Makefile.in up to 1.1.1.7
external/ibm-public/postfix/dist/src/postmap/postmap.c up to 1.5
external/ibm-public/postfix/dist/src/postqueue/postqueue.c up to 1.5
external/ibm-public/postfix/dist/src/postscreen/postscreen.c up to 1.5
external/ibm-public/postfix/dist/src/postscreen/postscreen_smtpd.c up to 1.5
external/ibm-public/postfix/dist/src/posttls-finger/posttls-finger.c up to 1.5
external/ibm-public/postfix/dist/src/proxymap/Makefile.in up to 1.1.1.6
external/ibm-public/postfix/dist/src/showq/showq.c up to 1.5
external/ibm-public/postfix/dist/src/smtp/Makefile.in up to 1.1.1.10
external/ibm-public/postfix/dist/src/smtp/lmtp_params.c up to 1.5
external/ibm-public/postfix/dist/src/smtp/smtp.c up to 1.13
external/ibm-public/postfix/dist/src/smtp/smtp.h up to 1.5
external/ibm-public/postfix/dist/src/smtp/smtp_addr.c up to 1.5
external/ibm-public/postfix/dist/src/smtp/smtp_addr.h up to 1.3
external/ibm-public/postfix/dist/src/smtp/smtp_connect.c up to 1.5
external/ibm-public/postfix/dist/src/smtp/smtp_params.c up to 1.5
external/ibm-public/postfix/dist/src/smtp/smtp_proto.c up to 1.5
external/ibm-public/postfix/dist/src/smtp/smtp_reuse.c up to 1.4
external/ibm-public/postfix/dist/src/smtp/smtp_session.c up to 1.5
external/ibm-public/postfix/dist/src/smtpd/Makefile.in up to 1.1.1.11
external/ibm-public/postfix/dist/src/smtpd/smtpd.c up to 1.20
external/ibm-public/postfix/dist/src/smtpd/smtpd.h up to 1.5
external/ibm-public/postfix/dist/src/smtpd/smtpd_check.c up to 1.6
external/ibm-public/postfix/dist/src/smtpd/smtpd_peer.c up to 1.5
external/ibm-public/postfix/dist/src/smtpd/smtpd_proxy.c up to 1.3
external/ibm-public/postfix/dist/src/smtpd/smtpd_sasl_glue.c up to 1.5
external/ibm-public/postfix/dist/src/smtpd/smtpd_server.in up to 1.1.1.4
external/ibm-public/postfix/dist/src/smtpd/smtpd_server.ref up to 1.1.1.4
external/ibm-public/postfix/dist/src/tls/Makefile.in up to 1.1.1.10
external/ibm-public/postfix/dist/src/tls/tls.h up to 1.5
external/ibm-public/postfix/dist/src/tls/tls_client.c up to 1.13
external/ibm-public/postfix/dist/src/tls/tls_dane.c up to 1.5
external/ibm-public/postfix/dist/src/tls/tls_dh.c up to 1.5
external/ibm-public/postfix/dist/src/tls/tls_fprint.c up to 1.4
external/ibm-public/postfix/dist/src/tls/tls_misc.c up to 1.5
external/ibm-public/postfix/dist/src/tls/tls_proxy.h up to 1.4
external/ibm-public/postfix/dist/src/tls/tls_proxy_client_misc.c up to 1.4
external/ibm-public/postfix/dist/src/tls/tls_proxy_client_print.c up to 1.4
external/ibm-public/postfix/dist/src/tls/tls_proxy_client_scan.c up to 1.4
external/ibm-public/postfix/dist/src/tls/tls_server.c up to 1.12
external/ibm-public/postfix/dist/src/tlsproxy/tlsproxy.c up to 1.6
external/ibm-public/postfix/dist/src/util/Makefile.in up to 1.1.1.11
external/ibm-public/postfix/dist/src/util/argv.c up to 1.4
external/ibm-public/postfix/dist/src/util/argv.h up to 1.4
external/ibm-public/postfix/dist/src/util/attr.h up to 1.5
external/ibm-public/postfix/dist/src/util/clean_env.c up to 1.3
external/ibm-public/postfix/dist/src/util/dict.c up to 1.4
external/ibm-public/postfix/dist/src/util/dict.h up to 1.5
external/ibm-public/postfix/dist/src/util/dict_cache.c up to 1.4
external/ibm-public/postfix/dist/src/util/dict_cdb.h up to 1.2
external/ibm-public/postfix/dist/src/util/dict_cidr.c up to 1.5
external/ibm-public/postfix/dist/src/util/dict_db.h up to 1.4
external/ibm-public/postfix/dist/src/util/dict_dbm.h up to 1.2
external/ibm-public/postfix/dist/src/util/dict_fail.h up to 1.2
external/ibm-public/postfix/dist/src/util/dict_lmdb.h up to 1.3
external/ibm-public/postfix/dist/src/util/dict_open.c up to 1.4
external/ibm-public/postfix/dist/src/util/dict_pcre.c up to 1.5
external/ibm-public/postfix/dist/src/util/dict_regexp.c up to 1.5
external/ibm-public/postfix/dist/src/util/dict_sdbm.h up to 1.2
external/ibm-public/postfix/dist/src/util/hash_fnv.c up to 1.3
external/ibm-public/postfix/dist/src/util/hash_fnv.h up to 1.3
external/ibm-public/postfix/dist/src/util/htable.c up to 1.4
external/ibm-public/postfix/dist/src/util/inet_connect.c up to 1.3
external/ibm-public/postfix/dist/src/util/make_dirs.c up to 1.2
external/ibm-public/postfix/dist/src/util/match_list.c up to 1.3
external/ibm-public/postfix/dist/src/util/mystrtok.c up to 1.4
external/ibm-public/postfix/dist/src/util/mystrtok.ref up to 1.1.1.2
external/ibm-public/postfix/dist/src/util/sock_addr.c up to 1.3
external/ibm-public/postfix/dist/src/util/sock_addr.h up to 1.2
external/ibm-public/postfix/dist/src/util/split_nameval.c up to 1.2
external/ibm-public/postfix/dist/src/util/stringops.h up to 1.5
external/ibm-public/postfix/dist/src/util/sys_defs.h up to 1.14
external/ibm-public/postfix/dist/src/util/unix_send_fd.c up to 1.8
external/ibm-public/postfix/dist/src/util/valid_hostname.c up to 1.3
external/ibm-public/postfix/dist/src/util/valid_hostname.h up to 1.2
external/ibm-public/postfix/dist/src/xsasl/xsasl_cyrus_server.c up to 1.4
external/ibm-public/postfix/lib/global/Makefile up to 1.10
external/ibm-public/postfix/lib/util/Makefile up to 1.11
doc/3RDPARTY (apply patch)
Update Postfix to 3.8.4.
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@Import Postfix 3.8.4 (last was 3.7.3)
December 22, 2023: 3.8.4/3.7.9
==============================
Security: this release adds support to defend against an email
spoofing attack (SMTP smuggling) on recipients at a Postfix server.
For background, see https://www.postfix.org/smtp-smuggling.html.
Sites concerned about SMTP smuggling attacks should enable this
feature on Internet-facing Postfix servers. For compatibility with
non-standard clients, Postfix by default excludes clients in
mynetworks from this countermeasure.
The recommended settings are:
# Optionally disconnect remote SMTP clients that send bare newlines,
# but allow local clients with non-standard SMTP implementations
# such as netcat, fax machines, or load balancer health checks.
#
smtpd_forbid_bare_newline = yes
smtpd_forbid_bare_newline_exclusions = $mynetworks
The smtpd_forbid_bare_newline feature is disabled by default.
November 1, 2023: 3.8.3/3.7.8
=============================
Bugfix (defect introduced Postfix 2.5, date 20080104): the Postfix
SMTP server was waiting for a client command instead of replying
immediately, after a client certificate verification error in TLS
wrappermode. Reported by Andreas Kinzler.
Usability: the Postfix SMTP server (finally) attempts to log the
SASL username after authentication failure. In Postfix logging,
this appends ", sasl_username=xxx" after the reason for SASL
authentication failure. The logging replaces an unavailable reason
with "(reason unavailable)", and replaces an unavailable sasl_username
with "(unavailable)". Based on code by Jozsef Kadlecsik.
Compatibility bugfix (defect introduced: Postfix 2.11, date 20130405):
in forward_path, the expression ${recipient_delimiter} would expand
to an empty string when a recipient address had no recipient
delimiter. The compatibility fix is to use a configured recipient
delimiter value instead. Reported by Tod A. Sandman.
September 1, 2023: 3.8.2/3.7.7
==============================
Bugfix (defect introduced: Postfix alpha, 19980207): the valid_hostname()
check in the Postfix DNS client library was blocking unusual but
legitimate wildcard names (*.name) in some DNS lookup results and
lookup requests. Examples:
name class/type result
*.one.example IN CNAME *.other.example
*.other.example IN A 10.0.0.1
*.other.example IN TLSA ..certificate info...
Such syntax is blesed in RFC 1034 section 4.3.3.
Bugfix (defect introduced: Postfix 3.0, 20140218): when an address
verification probe fails during or after an opportunistic TLS
handshake, don't enforce a minimum time-in-queue before falling
back to plaintext. Problem reported by Serg.
June 5, 2023: 3.8.1/3.7.6
=========================
Optional: harden a Postfix SMTP server against remote SMTP clients
that violate RFC 2920 (or 5321) command pipelining constraints.
With "smtpd_forbid_unauth_pipelining = yes", the server disconnects
a client immediately, after responding with "554 5.5.0 Error: SMTP
protocol synchronization" and after logging "improper command
pipelining" with the unexpected remote SMTP client input. This
feature is disabled by default in Postfix 3.5-3.8 to avoid breaking
home-grown utilities, but it is enabled by default in Postfix 3.9.
A similar feature is enabled by default in the Exim SMTP server.
Optional: some OS distributions crank up TLS security to 11, and
in doing so increase the number of plaintext email deliveries. This
introduces basic OpenSSL configuration file support that may be
used to override OS-level settings. Details are in the postconf(5)
manpage under tls_config_file and tls_config_name.
Bugfix (defect introduced: Postfix 1.0): the command "postconf ..
name=v1 .. name=v2 .." (multiple instances of the same parameter
name) created multiple main.cf name=value entries with the same
parameter name. It now logs a warning and skips the earlier name(s)
and value(s). Found during code maintenance.
Bugfix (defect introduced: Postfix 3.3): the command "postconf -M
name1/type1='name2 type2 ...'" died with a segmentation violation
when the request matched multiple master.cf entries. The master.cf
file was not damaged. Problem reported by SATOH Fumiyasu.
Bugfix (defect introduced: Postfix 2.11): the command "postconf -M
name1/type1='name2 type2 ...'" could add a service definition to
master.cf that conflicted with an already existing service definition.
It now replaces all existing service definitions that match the
service pattern 'name1/type1' or the service name and type in 'name2
type2 ...' with a single service definition 'name2 type2 ...'.
Problem reported by SATOH Fumiyasu.
Bugfix (defect introduced: Postfix 3.8) the posttls-finger command
could access uninitialized memory when reconnecting. This also
fixes a malformed warning message when a destination contains
":service" information. Reported by Thomas Korbar.
Bugfix (defect introduced: Postfix 3.2): the MySQL client could
return "not found" instead of "error" (for example, resulting in
a 5XX SMTP status instead of 4XX) during the time that all MySQL
server connections were turned down after error. Found during code
maintenance. File: global/dict_mysql.c. This was already fixed in
Postfix 3.4-3.7.
April 18, 2023: 3.7.5
=====================
Bugfix (problem introduced in Postfix 3.5): check_ccert_access did
not handle inline map specifications. Report and fix by Sean
Gallagher.
Bugfix (problem introduced in Postfix 3.4): the posttls-finger
command failed to detect that a connection was resumed in the case
that a server did not return a certificate. Fix by Viktor Dukhovni.
Workaround: OpenSSL 3.x EVP_get_cipherbyname() can return lazily-bound
handles. Postfix now checks that the expected functionality will
be available instead of failing later. Fix by Viktor Dukhovni.
Safety: the long form "{ name = value }" in import_environment or
export_environment is not documented (with spaces around the '='),
but it was silently accepted, and it was stored in the process
environment as the invalid form "name = value", thus not setting
or overriding an entry for "name". This form is now stored as the
expected "name=value". Found during code maintenance.
Bugfix (problem introduced in Postfix 3.2): the MySQL client could
return "not found" instead of "error" (for example, resulting in
a 5XX SMTP status instead of 4XX) during the time that all MySQL
server connections were turned down after error. Found during code
maintenance.
April 17, 2023: 3.8.0
=====================
Support to look up DNS SRV records in the Postfix SMTP/LMTP client,
Based on code by Tomas Korbar (Red Hat). For example, with
"use_srv_lookup = submission" and "relayhost = example.com:submission",
the Postfix SMTP client will look up DNS SRV records for
_submission._tcp.example.com, and will relay email through the
hosts and ports that are specified with those records.
TLS obsolescence: Postfix now treats the "export" and "low" cipher
grade settings as "medium". The "export" and "low" grades are no
longer supported in OpenSSL 1.1.1, the minimum version required in
Postfix 3.6.0 and later. Also, Postfix default settings now exclude
deprecated or unused ciphers (SEED, IDEA, 3DES, RC2, RC4, RC5),
digest (MD5), key exchange algorithms (DH, ECDH), and public key
algorithm (DSS).
Attack resistance: the Postfix SMTP server can now aggregate
smtpd_client_*_rate and smtpd_client_*_count statistics by network
block instead of by IP address, to raise the bar against a memory
exhaustion attack in the anvil(8) server; Postfix TLS support
unconditionally disables TLS renegotiation in the middle of an SMTP
connection, to avoid a CPU exhaustion attack.
The PostgreSQL client encoding is now configurable with the "encoding"
Postfix configuration file attribute. The default is "UTF8".
Previously the encoding was hard-coded as "LATIN1", which is not
useful in the context of SMTP.
The postconf command now warns for #comment in or after a Postfix
parameter value. Postfix programs do not support #comment after
other text, and treat that as input.
January 12, 2023: 3.7.4
=======================
Workaround: with OpenSSL 3 and later always turn on
SSL_OP_IGNORE_UNEXPECTED_EOF, to avoid warning messages and missed
opportunities for TLS session reuse. This is safe because the SMTP
protocol implements application-level framing, and is therefore
not affected by TLS truncation attacks. Fix by Viktor Dukhovni.
Workaround: OpenSSL 3.x EVP_get_digestbyname() can return lazily-bound
handles for digest implementations. In sufficiently hostile
configurations, Postfix could mistakenly believe that a digest
algorithm is available, and fail when it is not. A similar workaround
may be needed for EVP_get_cipherbyname(). Fix by Viktor Dukhovni.
Bugfix (bug introduced in Postfix 2.11): the checkok() macro in
tls/tls_fprint.c evaluated its argument unconditionally; it should
evaluate the argument only if there was no prior error. Found during
code review.
Bugfix (bug introduced in Postfix 2.8): postscreen died with a
segmentation violation when postscreen_dnsbl_threshold < 1. It
should reject such input with a fatal error instead. Discovered by
Benny Pedersen.
Bitrot: fixes for linker warnings from newer Darwin (MacOS) versions.
Viktor Dukhovni.
Portability: Linux 6 support.
Added missing documentation that cidr:, pcre: and regexp: tables
support inline specification only in Postfix 3.7 and later.
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or https://www.t29.dk/antiantivirus.txt.
Postfix
Backscatter HowtoThis document describes features that require Postfix version 2.0 or later.
Topics covered in this document:
The examples use Perl Compatible Regular Expressions (Postfix pcre: tables), but also provide a translation to POSIX regular expressions (Postfix regexp: tables). PCRE is preferred primarily because the implementation is often faster.
When a spammer or worm sends mail with forged sender addresses, innocent sites are flooded with undeliverable mail notifications. This is called backscatter mail. With Postfix, you know that you're a backscatter victim when your logfile goes on and on like this:
Dec 4 04:30:09 hostname postfix/smtpd[58549]: NOQUEUE: reject: RCPT from xxxxxxx[x.x.x.x]: 550 5.1.1 <yyyyyy@@your.domain.here>: Recipient address rejected: User unknown; from=<> to=<yyyyyy@@your.domain.here> proto=ESMTP helo=<zzzzzz>
What you see are lots of "user unknown" errors with "from=<>". These are error reports from MAILER-DAEMONs elsewhere on the Internet.
If your machine receives backscatter mail to random addresses, configure Postfix to reject all mail for non-existent recipients as described in the LOCAL_RECIPIENT_README and STANDARD_CONFIGURATION_README documentation.
If your machine runs Postfix 2.0 and earlier, disable the "pause before reject" feature in the SMTP server. If your system is under stress then it should not waste time.
/etc/postfix/main.cf: # Not needed with Postfix 2.1 and later. smtpd_error_sleep_time = 0 # Not needed with Postfix 2.4 and later. unknown_local_recipient_reject_code = 550
When backscatter mail passes the "unknown recipient" barrier, there still is no need to despair. Many mail systems are kind enough to attach the message headers of the undeliverable mail in the non-delivery notification. These message headers contain information that you can use to recognize and block forged mail.
Although my email address is "wietse@@porcupine.org", all my mail systems announce themselves with the SMTP HELO command as "hostname.porcupine.org". Thus, if returned mail has a Received: message header like this:
Received: from porcupine.org ...
Then I know that this is almost certainly forged mail (almost; see next section for the fly in the ointment). Mail that is really sent by my systems looks like this:
Received: from hostname.porcupine.org ...
For the same reason the following message headers are very likely to be the result of forgery:
Received: from host.example.com ([1.2.3.4] helo=porcupine.org) ... Received: from [1.2.3.4] (port=12345 helo=porcupine.org) ... Received: from host.example.com (HELO porcupine.org) ... Received: from host.example.com (EHLO porcupine.org) ...
Some forgeries show up in the way that a mail server reports itself in Received: message headers. Keeping in mind that all my systems have a mail server name of hostname.porcupine.org, the following is definitely a forgery:
Received: by porcupine.org ... Received: from host.example.com ( ... ) by porcupine.org ...
Another frequent sign of forgery is the Message-ID: header. My systems produce a Message-ID: of <stuff@@hostname.porcupine.org>. The following are forgeries, especially the first one:
Message-ID: <1cb479435d8eb9.2beb1.qmail@@porcupine.org> Message-ID: <yulszqocfzsficvzzju@@porcupine.org>
To block such backscatter I use header_checks and body_checks patterns like this:
/etc/postfix/main.cf: header_checks = pcre:/etc/postfix/header_checks body_checks = pcre:/etc/postfix/body_checks /etc/postfix/header_checks: if /^Received:/ /^Received: +from +(porcupine\.org) +/ reject forged client name in Received: header: $1 /^Received: +from +[^ ]+ +\(([^ ]+ +[he]+lo=|[he]+lo +)(porcupine\.org)\)/ reject forged client name in Received: header: $2 /^Received:.* +by +(porcupine\.org)\b/ reject forged mail server name in Received: header: $1 endif /^Message-ID:.* <!&!/ DUNNO /^Message-ID:.*@@(porcupine\.org)/ reject forged domain name in Message-ID: header: $1 /etc/postfix/body_checks: if /^[> ]*Received:/ /^[> ]*Received: +from +(porcupine\.org) / reject forged client name in Received: header: $1 /^[> ]*Received: +from +[^ ]+ +\(([^ ]+ +[he]+lo=|[he]+lo +)(porcupine\.org)\)/ reject forged client name in Received: header: $2 /^[> ]*Received:.* +by +(porcupine\.org)\b/ reject forged mail server name in Received: header: $1 endif /^[> ]*Message-ID:.* <!&!/ DUNNO /^[> ]*Message-ID:.*@@(porcupine\.org)/ reject forged domain name in Message-ID: header: $1
Notes:
The example uses pcre: tables mainly for speed; with minor modifications, you can use regexp: tables as explained below.
The example is simplified for educational purposes. In reality my patterns list multiple domain names, as "(domain|domain|...)".
The "\." matches "." literally. Without the "\", the "." would match any character.
The "\(" and "\)" match "(" and ")" literally. Without the "\", the "(" and ")" would be grouping operators.
The "\b" is used here to match the end of a word. If you use regexp: tables, specify "[[:>:]]" (on some systems you should specify "\>" instead; for details see your system documentation).
The "if /pattern/" and "endif" eliminate unnecessary matching attempts. DO NOT indent lines starting with /pattern/ between the "if" and "endif"!
The two "Message-ID:.* <!&!" rules are workarounds for some versions of Outlook express, as described in the caveats section below.
Netscape Messenger (and reportedly, Mozilla) sends a HELO name that is identical to the sender address domain part. If you have such clients then the above patterns would block legitimate email.
My network has only one such machine, and to prevent its mail from being blocked I have configured it to send mail as user@@hostname.porcupine.org. On the Postfix server, a canonical mapping translates this temporary address into user@@porcupine.org.
/etc/postfix/main.cf: canonical_maps = hash:/etc/postfix/canonical /etc/postfix/canonical: @@hostname.porcupine.org @@porcupine.org
This is of course practical only when you have very few systems that send HELO commands like this, and when you never have to send mail to a user on such a host.
An alternative would be to remove the hostname from "hostname.porcupine.org" with address masquerading, as described in the ADDRESS_REWRITING_README document.
Reportedly, Outlook 2003 (perhaps Outlook Express, and other versions as well) present substantially different Message-ID headers depending upon whether or not a DSN is requested (via Options "Request a delivery receipt for this message").
When a DSN is requested, Outlook 2003 uses a Message-ID string that ends in the sender's domain name:
Message-ID: <!&! ...very long string... ==@@example.com>
where example.com is the domain name part of the email address specified in Outlook's account settings for the user. Since many users configure their email addresses as username@@example.com, messages with DSN turned on will trigger the REJECT action in the previous section.
If you have such clients then you can to exclude their Message-ID strings with the two "Message-ID:.* <!&!" patterns that are shown in the previous section. Otherwise you will not be able to use the two backscatter rules to stop forged Message ID strings. Of course this workaround may break the next time Outlook is changed.
/etc/postfix/main.cf: header_checks = pcre:/etc/postfix/header_checks body_checks = pcre:/etc/postfix/body_checks /etc/postfix/header_checks: /^(From|Return-Path):.*\b(user@@domain\.tld)\b/ reject forged sender address in $1: header: $2 /etc/postfix/body_checks: /^[> ]*(From|Return-Path):.*\b(user@@domain\.tld)\b/ reject forged sender address in $1: header: $2
Notes:
The example uses pcre: tables mainly for speed; with minor modifications, you can use regexp: tables as explained below.
The example is simplified for educational purposes. In reality, my patterns list multiple email addresses as "(user1@@domain1\.tld|user2@@domain2\.tld)".
The two "\b" as used in "\b(user@@domain\.tld)\b" match the beginning and end of a word, respectively. If you use regexp: tables, specify "[[:<:]] and [[:>:]]" (on some systems you should specify "\< and \>" instead; for details see your system documentation).
The "\." matches "." literally. Without the "\", the "." would match any character.
Another sign of forgery can be found in the IP address that is recorded in Received: headers next to your HELO host or domain name. This information must be used with care, though. Some mail servers are behind a network address translator and never see the true client IP address.
With all the easily recognizable forgeries eliminated, there is one category of backscatter mail that remains, and that is notifications from virus scanner software. Unfortunately, some virus scanning software doesn't know that viruses forge sender addresses. To make matters worse, the software also doesn't know how to report a mail delivery problem, so that we cannot use the above techniques to recognize forgeries.
Recognizing virus scanner mail is an error prone process, because there is a lot of variation in report formats. The following is only a small example of message header patterns. For a large collection of header and body patterns that recognize virus notification email, see http://www.dkuug.dk/keld/virus/ or http://www.t29.dk/antiantivirus.txt.
/etc/postfix/header_checks:
/^Subject: *Your email contains VIRUSES/ DISCARD virus notification
/^Content-Disposition:.*VIRUS1_DETECTED_AND_REMOVED/
DISCARD virus notification
/^Content-Disposition:.*VirusWarning.txt/ DISCARD virus notification
Note: these documents haven't been updated since 2004, so they are useful only as a starting point.
A plea to virus or spam scanner operators: please do not make the problem worse by sending return mail to forged sender addresses. You're only harassing innocent people. If you must return mail to the purported sender, please return the full message headers, so that the sender can filter out the obvious forgeries.
@ 1.1.1.1.2.1 log @file BACKSCATTER_README.html was added on branch netbsd-5 on 2009-09-15 06:02:12 +0000 @ text @d1 406 @ 1.1.1.1.2.2 log @Apply patch (requested by tron in ticket #944): Update Postfix to 2.6.5. @ text @a0 406Postfix
Backscatter HowtoThis document describes features that require Postfix version 2.0 or later.
Topics covered in this document:
The examples use Perl Compatible Regular Expressions (Postfix pcre: tables), but also provide a translation to POSIX regular expressions (Postfix regexp: tables). PCRE is preferred primarily because the implementation is often faster.
When a spammer or worm sends mail with forged sender addresses, innocent sites are flooded with undeliverable mail notifications. This is called backscatter mail. With Postfix, you know that you're a backscatter victim when your logfile goes on and on like this:
Dec 4 04:30:09 hostname postfix/smtpd[58549]: NOQUEUE: reject: RCPT from xxxxxxx[x.x.x.x]: 550 5.1.1 <yyyyyy@@your.domain.here>: Recipient address rejected: User unknown; from=<> to=<yyyyyy@@your.domain.here> proto=ESMTP helo=<zzzzzz>
What you see are lots of "user unknown" errors with "from=<>". These are error reports from MAILER-DAEMONs elsewhere on the Internet.
If your machine receives backscatter mail to random addresses, configure Postfix to reject all mail for non-existent recipients as described in the LOCAL_RECIPIENT_README and STANDARD_CONFIGURATION_README documentation.
If your machine runs Postfix 2.0 and earlier, disable the "pause before reject" feature in the SMTP server. If your system is under stress then it should not waste time.
/etc/postfix/main.cf: # Not needed with Postfix 2.1 and later. smtpd_error_sleep_time = 0 # Not needed with Postfix 2.4 and later. unknown_local_recipient_reject_code = 550
When backscatter mail passes the "unknown recipient" barrier, there still is no need to despair. Many mail systems are kind enough to attach the message headers of the undeliverable mail in the non-delivery notification. These message headers contain information that you can use to recognize and block forged mail.
Although my email address is "wietse@@porcupine.org", all my mail systems announce themselves with the SMTP HELO command as "hostname.porcupine.org". Thus, if returned mail has a Received: message header like this:
Received: from porcupine.org ...
Then I know that this is almost certainly forged mail (almost; see next section for the fly in the ointment). Mail that is really sent by my systems looks like this:
Received: from hostname.porcupine.org ...
For the same reason the following message headers are very likely to be the result of forgery:
Received: from host.example.com ([1.2.3.4] helo=porcupine.org) ... Received: from [1.2.3.4] (port=12345 helo=porcupine.org) ... Received: from host.example.com (HELO porcupine.org) ... Received: from host.example.com (EHLO porcupine.org) ...
Some forgeries show up in the way that a mail server reports itself in Received: message headers. Keeping in mind that all my systems have a mail server name of hostname.porcupine.org, the following is definitely a forgery:
Received: by porcupine.org ... Received: from host.example.com ( ... ) by porcupine.org ...
Another frequent sign of forgery is the Message-ID: header. My systems produce a Message-ID: of <stuff@@hostname.porcupine.org>. The following are forgeries, especially the first one:
Message-ID: <1cb479435d8eb9.2beb1.qmail@@porcupine.org> Message-ID: <yulszqocfzsficvzzju@@porcupine.org>
To block such backscatter I use header_checks and body_checks patterns like this:
/etc/postfix/main.cf: header_checks = pcre:/etc/postfix/header_checks body_checks = pcre:/etc/postfix/body_checks /etc/postfix/header_checks: if /^Received:/ /^Received: +from +(porcupine\.org) +/ reject forged client name in Received: header: $1 /^Received: +from +[^ ]+ +\(([^ ]+ +[he]+lo=|[he]+lo +)(porcupine\.org)\)/ reject forged client name in Received: header: $2 /^Received:.* +by +(porcupine\.org)\b/ reject forged mail server name in Received: header: $1 endif /^Message-ID:.* <!&!/ DUNNO /^Message-ID:.*@@(porcupine\.org)/ reject forged domain name in Message-ID: header: $1 /etc/postfix/body_checks: if /^[> ]*Received:/ /^[> ]*Received: +from +(porcupine\.org) / reject forged client name in Received: header: $1 /^[> ]*Received: +from +[^ ]+ +\(([^ ]+ +[he]+lo=|[he]+lo +)(porcupine\.org)\)/ reject forged client name in Received: header: $2 /^[> ]*Received:.* +by +(porcupine\.org)\b/ reject forged mail server name in Received: header: $1 endif /^[> ]*Message-ID:.* <!&!/ DUNNO /^[> ]*Message-ID:.*@@(porcupine\.org)/ reject forged domain name in Message-ID: header: $1
Notes:
The example uses pcre: tables mainly for speed; with minor modifications, you can use regexp: tables as explained below.
The example is simplified for educational purposes. In reality my patterns list multiple domain names, as "(domain|domain|...)".
The "\." matches "." literally. Without the "\", the "." would match any character.
The "\(" and "\)" match "(" and ")" literally. Without the "\", the "(" and ")" would be grouping operators.
The "\b" is used here to match the end of a word. If you use regexp: tables, specify "[[:>:]]" (on some systems you should specify "\>" instead; for details see your system documentation).
The "if /pattern/" and "endif" eliminate unnecessary matching attempts. DO NOT indent lines starting with /pattern/ between the "if" and "endif"!
The two "Message-ID:.* <!&!" rules are workarounds for some versions of Outlook express, as described in the caveats section below.
Netscape Messenger (and reportedly, Mozilla) sends a HELO name that is identical to the sender address domain part. If you have such clients then the above patterns would block legitimate email.
My network has only one such machine, and to prevent its mail from being blocked I have configured it to send mail as user@@hostname.porcupine.org. On the Postfix server, a canonical mapping translates this temporary address into user@@porcupine.org.
/etc/postfix/main.cf: canonical_maps = hash:/etc/postfix/canonical /etc/postfix/canonical: @@hostname.porcupine.org @@porcupine.org
This is of course practical only when you have very few systems that send HELO commands like this, and when you never have to send mail to a user on such a host.
An alternative would be to remove the hostname from "hostname.porcupine.org" with address masquerading, as described in the ADDRESS_REWRITING_README document.
Reportedly, Outlook 2003 (perhaps Outlook Express, and other versions as well) present substantially different Message-ID headers depending upon whether or not a DSN is requested (via Options "Request a delivery receipt for this message").
When a DSN is requested, Outlook 2003 uses a Message-ID string that ends in the sender's domain name:
Message-ID: <!&! ...very long string... ==@@example.com>
where example.com is the domain name part of the email address specified in Outlook's account settings for the user. Since many users configure their email addresses as username@@example.com, messages with DSN turned on will trigger the REJECT action in the previous section.
If you have such clients then you can to exclude their Message-ID strings with the two "Message-ID:.* <!&!" patterns that are shown in the previous section. Otherwise you will not be able to use the two backscatter rules to stop forged Message ID strings. Of course this workaround may break the next time Outlook is changed.
/etc/postfix/main.cf: header_checks = pcre:/etc/postfix/header_checks body_checks = pcre:/etc/postfix/body_checks /etc/postfix/header_checks: /^(From|Return-Path):.*\b(user@@domain\.tld)\b/ reject forged sender address in $1: header: $2 /etc/postfix/body_checks: /^[> ]*(From|Return-Path):.*\b(user@@domain\.tld)\b/ reject forged sender address in $1: header: $2
Notes:
The example uses pcre: tables mainly for speed; with minor modifications, you can use regexp: tables as explained below.
The example is simplified for educational purposes. In reality, my patterns list multiple email addresses as "(user1@@domain1\.tld|user2@@domain2\.tld)".
The two "\b" as used in "\b(user@@domain\.tld)\b" match the beginning and end of a word, respectively. If you use regexp: tables, specify "[[:<:]] and [[:>:]]" (on some systems you should specify "\< and \>" instead; for details see your system documentation).
The "\." matches "." literally. Without the "\", the "." would match any character.
Another sign of forgery can be found in the IP address that is recorded in Received: headers next to your HELO host or domain name. This information must be used with care, though. Some mail servers are behind a network address translator and never see the true client IP address.
With all the easily recognizable forgeries eliminated, there is one category of backscatter mail that remains, and that is notifications from virus scanner software. Unfortunately, some virus scanning software doesn't know that viruses forge sender addresses. To make matters worse, the software also doesn't know how to report a mail delivery problem, so that we cannot use the above techniques to recognize forgeries.
Recognizing virus scanner mail is an error prone process, because there is a lot of variation in report formats. The following is only a small example of message header patterns. For a large collection of header and body patterns that recognize virus notification email, see http://www.dkuug.dk/keld/virus/ or http://www.t29.dk/antiantivirus.txt.
/etc/postfix/header_checks:
/^Subject: *Your email contains VIRUSES/ DISCARD virus notification
/^Content-Disposition:.*VIRUS1_DETECTED_AND_REMOVED/
DISCARD virus notification
/^Content-Disposition:.*VirusWarning.txt/ DISCARD virus notification
Note: these documents haven't been updated since 2004, so they are useful only as a starting point.
A plea to virus or spam scanner operators: please do not make the problem worse by sending return mail to forged sender addresses. You're only harassing innocent people. If you must return mail to the purported sender, please return the full message headers, so that the sender can filter out the obvious forgeries.
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