I have a small client who has a problem where he cannot email to SOME domains only. The error he gets is as follows:
This message hasn't been delivered yet. Delivery will continue to be attempted.
The server will keep trying to deliver this message for the next 1 days, 19 hours and 55 minutes. You'll be notified if the message can't be delivered by that time.
Eventually it fails.
This is a new server, and has a new firewall. Hopefully something simple. Need this resolved asap.
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