I host internal mail server with self integrated authentication. There is no NTLM, RADIUS, LDAP or AD available in the infrastructure. The mail service is only support SMTP 25 and POP3 110 without encryption. While I enable the Mail Protection for SMTP, add the server in Routing Host List and configure the mail server’s smart host to UTM. The mail server is able to send and receive on internet. I also can observe number of statistics on Email Protection tab.
However, our mail user will connect to send and receive from both internal and external. The UTM is intercepting the SMTP authentication from mail client with local account(UTM’s users) because we don’t have any backend authentication server available. Is there anyway to bypass UTM’s smtp authentication and let the mail server to complete it?
https://community.sophos.com/products/unified-threat-management/f/56/t/48217
Is only way to use ANY in Host-based Relay to use the mail server authentication?
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