On Thu, 30 Apr 1998, Timothy J Luoma wrote (excerpts):
There are a few mail programs out there which will send legit messages with
an invalid Message-ID.
Up to you, but I'd filter that one to a mailbox rather than /dev/null.
I get a lot of spam in which the Message-Id is "completed" in a
distinctive way by one of the mail servers at my ISP. If it has this
"completion" and is not addressed to me, it is almost certainly spam.
# Locally generated Message-Id:, not to me
:0
* $ ! ^TO$MY_ADDRX
* ^Message-ID: *<(_dot_)*(_at_)pony-[1-9]+\(_dot_)mail\(_dot_)digex\(_dot_)net>
{ WHICHRC=17
INCLUDERC=$PMDIR/bitbucket.rc }
$MY_ADDRX is a regexp catching legal permutations of my email address.
bitbucket.rc makes a special log entry and then delivers to /dev/null.
There is the remote possibility that somebody with a braindead mailer
might Bcc: me and trigger that recipe, but that is a chance I am
willing to take. I would probably notice such messages in the log, and
it hasn't happened yet.
Paul <pobart(_at_)access(_dot_)digex(_dot_)net>
..........................................................
Paul O. Bartlett, P.O. Box 857, Vienna, VA 22183-0857, USA
Finger, keyserver, or WWW for PGP public key
Home Page: http://www.access.digex.net/~pobart