Postfix with spamassassin05.01.15

1) Create a bash script to receive e-mail from Postfix and pipe it to SpamAssassin for rewriting. Then forward the rewritten version to Postfix's sendmail implementation:

#!/bin/bash
# 
# spamfilter.sh
# 
# Simple filter to plug SpamAssassin into the Postfix MTA
# 
# Modified by Jeremy Morton
# 
# This script should probably live at /usr/bin/spamfilter.sh
# ... and have 'chown root:root' and 'chmod 755' applied to it.
# 
# For use with:
#     Postfix 20010228 or later
#     SpamAssassin 2.42 or later

# Note: Modify the file locations to suit your particular
#       server and installation of SpamAssassin.
# File locations:
# (CHANGE AS REQUIRED TO SUIT YOUR SERVER)
SENDMAIL=/usr/sbin/sendmail
SPAMASSASSIN=/usr/bin/spamc

logger <<<"Spam filter piping to SpamAssassin, then to: $SENDMAIL $@"
${SPAMASSASSIN} | ${SENDMAIL} "$@"

exit $?

2) Ensure the newly-created /usr/bin/spamfilter.sh has correct permissions (0755), and is owned by root:root.

3) Modify the /etc/postfix/master.cf file; first, change the first 'smtp' line of the file to:

smtp      inet  n       -       -       -       -       smtpd -o content_filter=spamfilter

Then, add the following (a call to our newly-created spamfilter script) at the end:

spamfilter
          unix  -       n       n       -       -       pipe
   flags=Rq user=spamd argv=/usr/bin/spamfilter.sh -oi -f ${sender} ${recipient}

http://wiki.apache.org/spamassassin/IntegratedSpamdInPostfix

Anonymous

Postfix with spamassassin05.01.15

Information Epoch 1638440959