Upstream has implemented, but not released adding a new option to ignore timestamps that would resolve this bug. I've extracted the change from their svn, turned it into a patch. Looking at it, it seams reasonable and it builds, but I don't use mailfilter, so I can't test it.
If someone can verify this works, I'll upload it as an NMU if one of the maintainers can't. Please test.
diff -Nru mailfilter-0.8.2/debian/changelog mailfilter-0.8.2/debian/changelog --- mailfilter-0.8.2/debian/changelog 2012-04-22 20:32:40.000000000 -0400 +++ mailfilter-0.8.2/debian/changelog 2012-07-05 00:23:59.000000000 -0400 @@ -1,3 +1,11 @@ +mailfilter (0.8.2-3.1) unstable; urgency=low + + * Non-maintainer upload. + * Cherry pick from upstream svn rev 20 to add option to ignore timestamps + (Closes: #661261) + + -- Scott Kitterman <sc...@kitterman.com> Thu, 05 Jul 2012 00:22:58 -0400 + mailfilter (0.8.2-3) unstable; urgency=low * Switch to dpkg-source 3.0 (quilt) format (and remove dpatch) diff -Nru mailfilter-0.8.2/debian/patches/series mailfilter-0.8.2/debian/patches/series --- mailfilter-0.8.2/debian/patches/series 2012-04-22 20:32:40.000000000 -0400 +++ mailfilter-0.8.2/debian/patches/series 2012-07-05 00:24:45.000000000 -0400 @@ -1,3 +1,4 @@ 01_remove_workaround_fixed_FTBFS.patch 02_fix_build_newer_g++.patch 03_fix_invalid_conversion.patch +timestamp_ignore.diff diff -Nru mailfilter-0.8.2/debian/patches/timestamp_ignore.diff mailfilter-0.8.2/debian/patches/timestamp_ignore.diff --- mailfilter-0.8.2/debian/patches/timestamp_ignore.diff 1969-12-31 19:00:00.000000000 -0500 +++ mailfilter-0.8.2/debian/patches/timestamp_ignore.diff 2012-07-05 00:27:19.000000000 -0400 @@ -0,0 +1,246 @@ +Description: Add -i option to ignore timestamps + mailfilter (0.8.2-3.1) unstable; urgency=low + . + * Non-maintainer upload. + * Cherry pick from upstream svn rev 20 to add option to ignore timestamps + (Closes: #661261) +Author: Scott Kitterman <sc...@kitterman.com> +Origin: upstream +Bug: http://sourceforge.net/tracker/?func=detail&aid=2865702&group_id=14762&atid=114762 +Bug-Debian: http://bugs.debian.org/661261 +Forwarded: not-needed +Last-Update: <2012-07-04> + +--- mailfilter-0.8.2.orig/ChangeLog ++++ mailfilter-0.8.2/ChangeLog +@@ -1,6 +1,33 @@ + Mailfilter ChangeLog + -=-=-=-=-=-=-=-=-=-= + ++Sat Mar 3 17:40:14 EST 2012 baueran ++ ++ Index: src/socket.cc ++ Index: src/header.cc ++ ++ Ignore time stamps. ++ ++ Index: src/preferences.cc ++ Index: src/preferences.hh ++ ++ Add preferences to ignore time stamps. ++ ++ Index: src/mailfilter.cc ++ Index: src/mailfilter.hh ++ ++ Add Options. ++ ++ Index: configure.ac ++ ++ Change version number. ++ ++ Index: man/mailfilterrc.5 ++ Index: man/mailfilter.1 ++ Index: man/mailfilterex.5 ++ ++ Update man pages. ++ + Sun Jun 7 11:51:11 EST 2009 baueran + + - src/header.hh: new custom exception, add_entry throws it +--- mailfilter-0.8.2.orig/NEWS ++++ mailfilter-0.8.2/NEWS +@@ -20,6 +20,9 @@ mailfilter 0.8.1 (Sat Sep 15 17:14:49 ES + checked; 0 is only returned if the *entire* mailfilter session + was successful (Thanks to Mike Clarke for pointing this out) + ++ - Due to popular demand: Added option -i to ignore invalid ++ Message-ID time stamps. (Using this option is a potential ++ security risk, so do not use unless you know better!) + + mailfilter 0.8 (Mon Jan 1 16:09:52 CET 2007) [stable version] + +--- mailfilter-0.8.2.orig/configure.ac ++++ mailfilter-0.8.2/configure.ac +@@ -26,13 +26,13 @@ + # Process this file with autoconf to produce a configure script. + + AC_PREREQ(2.54) +-AC_INIT(mailfilter, 0.8.2, [mailfilter-...@lists.sourceforge.net]) ++AC_INIT(mailfilter, 0.8.2, [baue...@gmail.com]) + AC_REVISION($Revision: 1.1.2.4.2.12 $) + AC_SUBST(PACKAGE_COPYRIGHT) + AC_DEFINE(PACKAGE_COPYRIGHT, +- "Copyright (c) 2000 - 2009 Andreas Bauer <baue...@gmail.com>", ++ "Copyright (c) 2000 - 2012 Andreas Bauer <baue...@gmail.com>", + [Copyright information.]) +-AC_COPYRIGHT(Copyright (c) 2000 - 2009 Andreas Bauer <baue...@gmail.com>) ++AC_COPYRIGHT(Copyright (c) 2000 - 2012 Andreas Bauer <baue...@gmail.com>) + + AC_CONFIG_SRCDIR([src/mailfilter.cc]) + AC_CONFIG_HEADERS(config.h) +--- mailfilter-0.8.2.orig/man/mailfilterrc.5 ++++ mailfilter-0.8.2/man/mailfilterrc.5 +@@ -324,7 +324,7 @@ configuration files. + .BR mailfilterex (5), + .BR regex (7) + .SH COPYRIGHT +-Copyright \(co 2000-2009 Andreas Bauer <baue...@gmail.com> ++Copyright \(co 2000-2012 Andreas Bauer <baue...@gmail.com> + .PP + This is free software; see the source for copying conditions. There is NO + warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +--- mailfilter-0.8.2.orig/man/mailfilter.1 ++++ mailfilter-0.8.2/man/mailfilter.1 +@@ -58,6 +58,9 @@ Enable additional return values + \fB\-t\fR, \fB\-\-test\fR + Simulate deletes + .TP ++\fB\-i\fR, \fB\-\-ignore-time-stamps\fR ++Ignore invalid Message-ID time stamps (Do not use unless you know better!) ++.TP + \fB\-v\fR, \fB\-\-verbose\fR=\fILEVEL\fR + Specify level of verbosity + .TP +@@ -69,7 +72,7 @@ Display version information + .BR procmail (1), + .BR regex (7) + .SH COPYRIGHT +-Copyright \(co 2000-2009 Andreas Bauer <baue...@gmail.com> ++Copyright \(co 2000-2012 Andreas Bauer <baue...@gmail.com> + .PP + This is free software; see the source for copying conditions. There is NO + warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +--- mailfilter-0.8.2.orig/man/mailfilterex.5 ++++ mailfilter-0.8.2/man/mailfilterex.5 +@@ -235,7 +235,7 @@ them. + .BR procmailex (5), + .BR regex (7) + .SH COPYRIGHT +-Copyright \(co 2000-2009 Andreas Bauer <baue...@gmail.com> ++Copyright \(co 2000-2012 Andreas Bauer <baue...@gmail.com> + .PP + This is free software; see the source for copying conditions. There is NO + warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. +--- mailfilter-0.8.2.orig/src/preferences.hh ++++ mailfilter-0.8.2/src/preferences.hh +@@ -48,6 +48,7 @@ protected: + bool show_headers; + bool del_duplicates; + bool ret_status; ++ bool _ignore_time_stamp; + int high_score; + unsigned time_out_val; + int max_size; +@@ -122,6 +123,8 @@ public: + void set_test_mode (const char*); + int maxlength (void); + void set_maxlength (int); ++ bool ignore_time_stamp (); ++ void set_ignore_time_stamp (bool = true); + bool return_status (void); + void set_return_status (bool); + vector<Account>* accounts (void); +--- mailfilter-0.8.2.orig/src/header.cc ++++ mailfilter-0.8.2/src/header.cc +@@ -94,7 +94,8 @@ void Header :: add_entry (const char* ta + + if (cmp_no_case (tag, "Message-Id") == 0) + { +- if (rfc822_valid_msgid (body) < 0) ++ if (!Preferences :: Instance ().ignore_time_stamp() ++ && rfc822_valid_msgid (body) < 0) + { + Feedback* logger = Feedback :: Instance (); + logger->print_err ("POP timestamp in message-ID invalid."); +--- mailfilter-0.8.2.orig/src/mailfilter.cc ++++ mailfilter-0.8.2/src/mailfilter.cc +@@ -1,5 +1,5 @@ + // mailfilter.cc - source file for the mailfilter program +-// Copyright (c) 2000 - 2009 Andreas Bauer <baue...@gmail.com> ++// Copyright (c) 2000 - 2012 Andreas Bauer <baue...@gmail.com> + // + // This program is free software; you can redistribute it and/or modify + // it under the terms of the GNU General Public License as published by +@@ -53,6 +53,7 @@ static struct option long_options[] = + {"verbose", 1, NULL, VALUE_VERBOSE}, + {"mailfilterrc", 1, NULL, VALUE_MAILFILTERRC}, + {"logfile", 1, NULL, VALUE_LOGFILE}, ++ {"ignore-time-stamps", 0, NULL, VALUE_TIMESTAMP}, + {"version", 0, NULL, VALUE_VERSION}, + {"test", 0, NULL, VALUE_TEST}, + {"return-value", 0, NULL, VALUE_RETURN}, +@@ -219,7 +220,7 @@ void get_opts (int argc, char* argv[]) + int option = 0; + int option_index = 0; + +- while ((option = getopt_long (argc, argv, "hL:M:Vv:tr", ++ while ((option = getopt_long (argc, argv, "hL:M:Vv:tir", + long_options, &option_index)) != -1) + { + switch (option) +@@ -247,6 +248,8 @@ void get_opts (int argc, char* argv[]) + cout << "Enable additional return values" << endl; + cout << " -t, --test "; + cout << "Simulate deletes" << endl; ++ cout << " -i, --ignore-time-stamps "; ++ cout << "Ignore invalid Message-ID time stamps (Do not use unless you know better!)" << endl; + cout << " -v, --verbose=LEVEL "; + cout << "Specify level of verbosity" << endl; + cout << " -V, --version "; +@@ -280,6 +283,10 @@ void get_opts (int argc, char* argv[]) + case VALUE_TEST: + Preferences :: Instance ().set_test_mode ("yes"); + break; ++ case 'i': ++ case VALUE_TIMESTAMP: ++ Preferences :: Instance().ignore_time_stamp(); ++ break; + case 'r': + case VALUE_RETURN: + Preferences :: Instance ().set_return_status (true); +--- mailfilter-0.8.2.orig/src/mailfilter.hh ++++ mailfilter-0.8.2/src/mailfilter.hh +@@ -1,5 +1,5 @@ + // mailfilter.hh - source file for the mailfilter program +-// Copyright (c) 2000 - 2009 Andreas Bauer <baue...@gmail.com> ++// Copyright (c) 2000 - 2012 Andreas Bauer <baue...@gmail.com> + // + // This program is free software; you can redistribute it and/or modify + // it under the terms of the GNU General Public License as published by +@@ -36,6 +36,7 @@ using namespace std; + #define VALUE_VERSION 5 + #define VALUE_TEST 6 + #define VALUE_RETURN 7 ++#define VALUE_TIMESTAMP 8 + + #define ERROR_MSG(msg) \ + cerr << PACKAGE_NAME \ +--- mailfilter-0.8.2.orig/src/preferences.cc ++++ mailfilter-0.8.2/src/preferences.cc +@@ -58,6 +58,7 @@ Preferences :: Preferences () + show_headers = false; + del_duplicates = false; + ret_status = false; ++ _ignore_time_stamp= false; + high_score = 100; + time_out_val = 30; + negative_allows = 0; +@@ -92,7 +93,17 @@ void Preferences :: kill (void) + while (die_account != (Preferences :: accnts).end ()) + { die_account->clear (); die_account++; } + } +- ++ ++void Preferences :: set_ignore_time_stamp(bool new_ts) ++{ ++ _ignore_time_stamp = new_ts; ++} ++ ++bool Preferences :: ignore_time_stamp() ++{ ++ return _ignore_time_stamp; ++} ++ + // This function tries to locate a preferences file and, upon success, + // stores the file path in prefs_file. However, no data is loaded by + // the open() function.
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