We have recently shifted to XG 330 firewall and currently in transition phase. We have configured email protection with MTA mode at DR site with backup mail server (Mdaemon) in DMZ zone. The clients are configured to use Mapped IP (Public IP) of mail server with authenticated SMTP relaying. The firewall is intercepting traffic for both port 25 and 587 ports, however authenticated relay is not working from both WAN as well as from LAN side and they are getting error "Sending' reported error (0x800CCC80) : 'None of the authentication methods supported by this client are supported by your server.' " Please help me to resolve this or point me to comprehensive how to for implementing MTA mode (the guide at Sophos site leaves several question unanswered.
Taufeeq
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