Postfix content_filter (Was: Re: mailing list speed)

[David Relson]

Amos,

Below is some information on using bogofilter as a postfix filter.  This is 
work I did a while back while I was figuring out how to get postfix to work 
with a spam filter.  I've removed a bit of debugging stuff from the script, 
but don't think I've broken it.  Let me know how it goes.

David

In /etc/postfix/master.cf:

     Add a line after the smtp line, as in:

	smtp	  inet	n	-	n	-	-	smtpd
	  -o content_filter=filter:

     At the end, add the following:

	filter	  unix	-	n	n	-	-	pipe
	    flags=R user=filter argv=/usr/local/bin/filter.sh -f ${sender} -- 
${recipient}


For /usr/local/bin/filter.sh, I have:

     #!/bin/sh

     BOGOFILTER=/usr/local/bin/bogofilter
     BOGOFILTER_DIR=/var/spool/filter
     SENDMAIL=/usr/lib/sendmail

     # Exit codes from <sysexits.h>
     EX_TEMPFAIL=75
     EX_UNAVAILABLE=69

     cd $BOGOFILTER_DIR || { echo $BOGOFILTER_DIR does not exist; exit 
$EX_TEMPFAIL; }

     # Clean up when done or when aborting.
     trap "rm -f inp.$$ msg.$$" 0 1 2 3 15

     # bogofilter returns: 0 for spam; 1 for non-spam; 2 for I/O or other 
errors.

     cat | $BOGOFILTER -d /var/lib/bogofilter/ -p > msg.$$

     $SENDMAIL "$@" < msg.$$

     exit $?


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