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Since we upgraded from UTM to XG last month i've been fighting MTA mode in various ways. I've got a domain that when we send to we get the following undeliverable response from:
Mail delivery to following recipients failed:
What is the present version of SF-OS, active on the appliance? There was a similar issue which was fixed in v17 MR-6, please upgrade and let us know if it works.
In reply to sachingurung:
SFOS 17.0.6 MR-6
In reply to Jonathan LaMaster:
Enable debug for awarrenmta service and PM me the awarrenmt_debug.log. PM me some more information about the sender, the domain and the time of error. Refer to, Sophos XG Firewall: Where to find log files? to enable debug mode.