> There is no way to determine definitively, and certainly not quickly > while the receiving mail server is in mid-SMTP-session, whether > [EMAIL PROTECTED] exists or not.
Actually, IMail does just that for local domains--which is what Davy is getting at--but only if you're using the spammer's friend, 'Relay for Local Users.' Others have expressed his same frustration: that this welcome sensitivity to MAIL FROM: validity is abandoned once you go with 'No Mail Relay.' Obviously, IMGate can't do that for a userbase that is not accessible, but the rest of your measures are impressive! -Sandy P.S. Technically speaking, yes, validating against a local user database does not establish that the user does not *exist* per se at the domain (i.e. it could exist at a peer server) but the intent and results are clear enough during the session. To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
