Hello!
I faced the problem with outlook configuration to use external mail servers for sending mail. External mail server requires authentication and use TLS (port 587).
All mails goes from outlook to XG and hangs in mail spool with ststus queued. After some time status became failed (destination unreachable).
If I configured the same external mail server to sent notifications from XG, it works fine.
XG is configured in MTA mode.
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