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...
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!