The standard procedure is to write and check an X-Loop header in such
situations. You should also ensure not to delete somebody *else's* headers.
Unfortunately not everybody adheres to this.
My venerable procmail guide (along with many others out there) shows this:
http://www.inwa.net/~m3047/procmail/procmail-guide.html
peter(_at_)compclass(_dot_)com wrote:
[...]
I have a spam filter (right out of Stopping Spam - O'reilly) that bounces
mail back to the sender if they aren't recognized and/or authorized via a
key phrase. My problem is, what to do if both sender and receiver have
this filter? I'm thinking that I can add a string to the subject line on
the outgoing bounce or scan the entire message body for my original bounce
message. The latter seems safer but more CPU intensive.
--
Fred Morris
m3047(_at_)inwa(_dot_)net
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