Quote:
Originally Posted by Stokkes
This is just baffling. I'm in IT professionally and really what I need to do is find a way to talk to a Fastmail admin - someone with root level access to the servers so we can see what's going on.
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If, as I suspect, the issue is at the sending end, and Fastmail never sees any attempt to send the message, I cannot see how root access to Fastmail's servers would be any help. What is needed is the logs at the sending end. Do any of the senders who cannot reach Fastmail have good support teams who might be willing to work with you? Have you looked at the failing senders to see if there is a common factor (such as their using the same mail service)?
Those suggesting TTL and email address issues have presumably not considered the tests you have done switching back to Google and then to Fastmail again. The sending side (if the narrative so far is accurate) simply cannot reach the Fastmail MX servers.