On Fri, 07 Jul 2000 16:34:30 -0400, "Susannah D. Rosenberg" <[EMAIL PROTECTED]> said: >packet filtering mean anything to you? I understand the concept. I'm stating that there's no way you can tell a TCP SYN on port 25 from an MTA from a TCP SYN on port 25 from telnet. They look exactly the same. Kelly _______________________________________________ techtalk mailing list [EMAIL PROTECTED] http://www.linux.org.uk/mailman/listinfo/techtalk