> The DNS lookup on that domain "gmcofa.com" shows to be correct and I can
> email it from any other source but no part of my imail server will talk to
> that mail server for some very strange reason.
That "very strange reason" is that the DNS entry for gmcofa.com is bogus.
The MX record points to a domain called "63.144.218.219", which is not a
valid domain name. MX records must point to domain names, not IP addresses,
per the RFCs.
As standard procedure, I would E-mail the DNS administrator for gmcofa.com
(whose E-mail address should show up in the SOA record), but their DNS
administrator's E-mail address is listed as just "admin".
They have problems, not you.
-Scott
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