VRFY is part of SMTP, but many disable this on their server, as it allows enumeration of usernames on the system (useful for bruteforce attacks.) Here, I would surmise that SPF is your only real option for doing anything like this. Perhaps I'm wrong though... On Tue, 14 Sep 2004 16:06:10 -0500, Ben Bargabus <ben_b at ppdonline.com> wrote: > Hi, > Is there a way (or program/script I can run) to verify that incoming > messages come from valid email addys and bounce those that don't? I > know that the from header can easily be forged but I at least want to > verify that the forged header is a legit user name on that server. Just > looking for another way to cut down on sp at m here. By the way, I run > sendmail and procmail if that matters. > Ben. _______________________________________________ TCLUG Mailing List - Minneapolis/St. Paul, Minnesota Help beta test TCLUG's potential new home: http://plone.mn-linux.org Got pictures for TCLUG? Beta test http://plone.mn-linux.org/gallery tclug-list at mn-linux.org https://mailman.real-time.com/mailman/listinfo/tclug-list