/usr/share/spamassassin/20_freemail.cf is in spamassassin 3.4.1-8build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 | # SpamAssassin - FreeMail rules
#
# Please don't modify this file as your changes will be overwritten with
# the next update. Use @@LOCAL_RULES_DIR@@/local.cf instead.
# See 'perldoc Mail::SpamAssassin::Conf' for details.
#
# <@LICENSE>
# Licensed to the Apache Software Foundation (ASF) under one or more
# contributor license agreements. See the NOTICE file distributed with
# this work for additional information regarding copyright ownership.
# The ASF licenses this file to you under the Apache License, Version 2.0
# (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# </@LICENSE>
#
###########################################################################
ifplugin Mail::SpamAssassin::Plugin::FreeMail
body __freemail_safe_fwd /---\s?(?:(?:Forwarded|Original) message|Alkuper.inen viesti)/i
header __freemail_safe_rls X-Spam-Relays-External =~ /^[^\]]+ rdns=\S+\.(?:tfbnw\.net|ebay\.com|tieto\.com) /
meta __freemail_safe __freemail_safe_fwd || __ML2 || __ML4 || __HAS_X_MAILING_LIST || __freemail_safe_rls
header __freemail_replyto eval:check_freemail_replyto('replyto')
meta FREEMAIL_REPLYTO __freemail_replyto && !__freemail_safe
describe FREEMAIL_REPLYTO Reply-To/From or Reply-To/body contain different freemails
score FREEMAIL_REPLYTO 2
header __freemail_reply eval:check_freemail_replyto('reply')
meta FREEMAIL_REPLY __freemail_reply && !__freemail_replyto && !__freemail_safe
describe FREEMAIL_REPLY From and body contain different freemails
score FREEMAIL_REPLY 0.5
header FREEMAIL_FROM eval:check_freemail_from()
describe FREEMAIL_FROM Sender email is commonly abused enduser mail provider
score FREEMAIL_FROM 0.001
header FREEMAIL_ENVFROM_END_DIGIT eval:check_freemail_header('EnvelopeFrom', '\d@')
describe FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in digit
score FREEMAIL_ENVFROM_END_DIGIT 0.1
header FREEMAIL_REPLYTO_END_DIGIT eval:check_freemail_header('Reply-To', '\d@')
describe FREEMAIL_REPLYTO_END_DIGIT Reply-To freemail username ends in digit
score FREEMAIL_REPLYTO_END_DIGIT 0.1
#header FREEMAIL_SUBJECT eval:check_freemail_header('Subject')
#describe FREEMAIL_SUBJECT Subject contains freemail
#score FREEMAIL_SUBJECT 0.001
# Idea from John Hardin
header __freemail_hdr_replyto eval:check_freemail_header('Reply-To')
meta FREEMAIL_FORGED_REPLYTO __freemail_hdr_replyto && !FREEMAIL_FROM && !__freemail_safe
describe FREEMAIL_FORGED_REPLYTO Freemail in Reply-To, but not From
score FREEMAIL_FORGED_REPLYTO 0.1
endif
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