From: Crispin Olson (colsonrdemail.com)
Date: Tue Apr 01 2003 - 13:59:58 CST

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Folks,
I have a filter that works OK using the 'content_filter' method - I have
a c program that takes piped input, and reinjects into the system using
a different port, where the filtering has been disabled with a -o
content_filter= {blank} in the command in master.cf - and this daemon is
only bound to the loopback so only programs running locally (like my
filter) can get access.
The intent is to check, then redirect messages that contain a pattern in
the header, and it works fine

However, I would like to move to using the regular expression checks in
2.0, to avoid having to put mail that doesn't contain the pattern
through the filter. So I added

  header_checks=regexp:/usr/postfix/header_checks

in main.cf. In header checks I put

 /mypattern/ FILTER myfilter:

(had to add the : even though it says the nexthop bit after the
transport is optional)

In order to avoid a content filtering loop I modified my unfiltered
daemon in master.cf to read -o header_checks= {blank}

However it would seem that the system doesn't allow me to override, and
I end up with a content filtering loop anyway. I've also tried the other
way around
    -o header_checks=regexp:/usr/postfix/header_checks
after the main SMTP daemon entry in master.cf, and removing the config
line from main.cf, but its clear that the header_checks aren't even made
then, suggesting header_checks can't be overridden with -o

In the last piece of FILTER_README that describes this under "Getting
Nasty" it says you have to be careful to reinject through a clean
unfiltered SMTP daemon, but it doesn't say how.

Anyone any idea?

Crispin Olson

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