I use two sophos xg 310 instances as HA they are on MTA mode, once upgraded to firmware version SFOS-20.0.1-MR-1-Build342 emails to some domains get bounced with error :"R=default_mx_router T=remote_smtp: all hosts for '[doamin.com]' have been failing for a long time (and retry time not reached) DT=0.000s"" when I restart the active node those domain's issue resolved but other domains faces the same error. It seems that each node works with some domain fine but encounters problem with some others.
I appreciate your help and support on this matter to troubleshoot and resolve as it has been very irritating.
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