I have moved 8.0.6 to a new server with faster CPU more RAM and SSD.
The server also runs Bind 9.
I am now finding that virtually all outbound mail (both internal and external) is held in the Deferred Queue immediately.
If I select Requeue within the GUI Administrator it is immediately sent without problems.
So I am needing to manually requeue the mail on a regular basis.
Can anyone please suggest a fix for this?
Is it that the system is now to fast for the MTA to handle?
Any advice / help gratefully received.
Thanks and kind regards,