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paulrauschFlag for United States of America

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Incoming Mail issues

Having a strange issue that I can't seem to figure out.
Transferred my domain to a new registrar, rebuilt the DNS records, now some people are having issues receiving mail from senders. Everything seems random, have found almost no common-denominators.

Setup is an internal exchange server (singular).
Mx record mail.mydomain.com points to an IP address, resolves every time I look the record up.

Using the microsoft exchange connectivity tool, I'm having different results nearly every single time I run the test.
Under exchange tests, I run an incoming mail test, put in the users email address and run it.

Sometimes it resolves correctly, sometimes It cannot find a MX record for the domain, sometimes it can't find a valid host record...
example errors:

      The Microsoft Connectivity Analyzer wasn't able to retrieve MX records from DNS.
try again a second later, it worked.

I see no problems with the DNS zone file, the MX and A records look fine. Various emailers have gotten kickbacks
stating domain does not exist,

#554 5.4.4 SMTPSEND.DNS.NonExistentDomain; nonexistent domain ##
I've tested a great deal of things, completely puzzled here.

any and all feedback is greatly appreciated!
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JeffG2583

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Looks like two things are likely.

DNS replication lag, alongside, strangely enough, problems with the microsoft connectivity analyzer.
Looks like it might have problems resolving names -.- I've read of other people having the same problem
with problems resolving host names.

You both suggested my first suspicions, but kudos nonetheless :).