This is OT for this list but am hoping someone could provide me some input.

We have been having problems sending to one domain that we do not host.
After investigating it, here is what I have found.

The domain "ipapilot.org" has 2 MX records.

Sometimes, our DNS server wants to use their 2 MX record even though that
domain has properly configured priority numbers and their primary server is
active.

The problem when it does resolve to their 2 MX record, is that server does
not except email.  So then the message gets requeued and still tries to
deliver to the 2nd MX until finally the number tries have been reached in
iMail and the email returns to sender.

We have, after talking to ipapilot.org to them about (why they have 2nd
email server that doesn't accept any mail); proves useless.  To me, it
appears they are using that 2 MX as a greylist server as the response from
it is always: 451 Try Again.

Our caching in Imail has been turned off for years.  So the problem may be
in our DNS Server (Simple DNS Plus) where it's not retrying to get the MX
record again; but rather using it's cache.

Sometimes our DNS does pull the primary MX, other times the 2 MX.

Is this a problem with our DNS?  Or does DNS pull any MX it finds (no matter
the priority?)

Thanks,
Erik

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