Jack Knowlton:
> I would like to add a custom header, something like "X-Abuse: if
> spam/uce email ab...@mydomain.com".  How should I go about, without
> postfix adding the header twice (before and after dkimfilter-out)?

Wietse
> See the discussion of receive_override_options in the FILTER_README
> documentation (http://www.postfix.org/FILTER_README.html).

Jack Knowlton:
> Thanks. It does seem to work :)
> 
> Now I would like to add another header, right under the X-Abuse.
> How can I perform that?  I tried with the same regex based on
> /^Subject: .*/, but it doesn't seem to be adding both..

Postfix header/body_checks are not intended to provide a complete
message content manipulation system.

In this case, a Milter plug-in would be more appropriate. 

Applying header/body_checks etc. rules to output from header/body_checks
rules would be unsafe.

        Wietse

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