Is it common for an MTA to just assume a server it is sending to speaks ESMTP or should it check first? The MTA in question is zmailer and I'm sending to some kind of MTA or firewall that seems to only speak SMTP and there doesn't appear to be any fallback going on. -Nate Nathan Smith McKee, Voorhees & Sease, P.L.C. 515.288.3667