/etc/prelude-lml/ruleset/postfix.rules is in prelude-lml 1.0.0-5.3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (C) 2004 Exaprotect Technology
# All Rights Reserved
# Currently supported by John R Shannon <john at johnrshannon dot com>
#
# Author: David Maciejak
#
# This file is part of the Prelude-LML program.
#
# 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
# the Free Software Foundation; either version 2, or (at your option)
# any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; see the file COPYING. If not, write to
# the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
#
#####
#############################################################################
#
# This ruleset aims for analyzing postfix log
#
# You need to listen for /var/log/maillog
#
# Tested with postfix-2.0.11
#
#############################################################################
#LOG:May 3 17:41:05 exademo postfix/smtpd[6161]: 7F70283BF6: reject: RCPT from unknown[212.180.111.248]: 554 <dmaciejak@exaprobe.com>: Relay access denied; from=<DIEU> to=<dmaciejak@exaprobe.com> proto=SMTP helo=<koma>
regex=reject: RCPT from [\w\-\.]+\[([\d\.]+)\]: .* Relay access denied. from=<(\S+)> to=<(\S+)> proto=SMTP; \
classification.text=Mail server: Relay access denied; \
id=3500; \
revision=1; \
analyzer(0).name=Postfix; \
analyzer(0).manufacturer=www.postfix.org; \
analyzer(0).class=Service; \
assessment.impact.completion=failed; \
assessment.impact.type=user; \
assessment.impact.severity=medium; \
assessment.impact.description=$2 from $1 attempted to use mail server as relay; \
source(0).node.address(0).category=ipv4-addr; \
source(0).node.address(0).address=$1; \
source(0).node.address(1).category=e-mail; \
source(0).node.address(1).address=$2; \
source(0).service.iana_protocol_name=tcp; \
source(0).service.iana_protocol_number=6; \
target(0).service.iana_protocol_name=tcp; \
target(0).service.iana_protocol_number=6; \
target(0).service.port=25; \
target(0).service.name=smtp; \
target(0).node.address(0).category=e-mail; \
target(0).node.address(0).address=$3; \
last;
#LOG:May 3 12:22:14 exademo postfix/postfix-script: starting the Postfix mail system
regex=starting the Postfix mail system; \
classification.text=Mail server startup; \
id=3501; \
revision=1; \
analyzer(0).name=Postfix; \
analyzer(0).manufacturer=www.postfix.org; \
analyzer(0).class=Service; \
assessment.impact.completion=succeeded; \
assessment.impact.description=Mail server started; \
assessment.impact.type=other; \
assessment.impact.severity=info; \
last;
#LOG:May 4 11:43:10 exademo postfix/postfix-script: stopping the Postfix mail system
regex=stopping the Postfix mail system; \
classification.text=Mail server shutdown; \
id=3502; \
revision=1; \
analyzer(0).name=Postfix; \
analyzer(0).manufacturer=www.postfix.org; \
analyzer(0).class=Service; \
assessment.impact.completion=succeeded; \
assessment.impact.description=Mail server stopped; \
assessment.impact.type=other; \
assessment.impact.severity=medium; \
last;
#LOG:May 4 09:26:15 exademo postfix/smtpd[8472]: lost connection after CONNECT from localhost[127.0.0.1]
regex=lost connection after (\S+) from [\w\-\.]+\[([\d\.]+)\]; \
classification.text=Mail server suspicious access; \
id=3503; \
revision=1; \
analyzer(0).name=Postfix; \
analyzer(0).manufacturer=www.postfix.org; \
analyzer(0).class=Service; \
assessment.impact.completion=failed; \
assessment.impact.description=Lost connection from $2 after $1 action; \
assessment.impact.type=other; \
assessment.impact.severity=low; \
source(0).node.address(0).category=ipv4-addr; \
source(0).node.address(0).address=$2; \
target(0).service.iana_protocol_name=tcp; \
target(0).service.iana_protocol_number=6; \
target(0).service.port=25; \
target(0).service.name=smtp; \
last;
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