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From: Michael R Cook <mcook@cognex.com>
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Subject: spam filtering on message-id (was: Hmm.. 2 q's)
Date: 19 Jul 1997 12:14:06 -0400
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>>>>> "RS" == Randal Schwartz <merlyn@stonehenge.com> writes:

 RS> I know the *right* side (or rightmost side if multiple) of the @
 RS> has to be a valid hostname, so you could filter on (perl regex):

 RS> 	Message-Id: !/\@([-a-zA-Z0-9]+\.)+[a-zA-Z]{2,3})$/ { DELETE; }

 RS> and be pretty close.  (And yes, no _ in hostnames, please. :-)

Unfortunately, I get a good amount of non-spam that has invalid
message-ids.  So much for standards. :-(

This (perl) pattern seems to work quite well, though:

   /<\S+\@\S+>/

I grepped all my unexpired mail, and got only two false hits.  It found many
messages in my `spam' folder.