Tugger the SLUGger!SLUG Mailing List Archives

[SLUG] Mail filtering with .forward, procmail and perl.

Dear list,

I've been using procmail to filter my mail. However I'm getting more
and more emails with a "Reply-To" header (a web-based support program
that I have no control on). It's pointless to reply to a program and I
can't sort my mail by Sender.

So my question is:

Is there a way to pipe my mail through a filter before/after procmail
or to rewrite the From header inside procmail?