[IMail Forum] MX Record is an IP not a Hostname

[Jeff Pereira]

How does IMAIL generally function when the MX record for the receiving domain is an IP addresss and not a hostname ?   I just had such a case and it turned out that it was trying to connect to the A-Record and I was getting an unknown user error.  Why would it go to the A-Record and not just attempt to deliver to the IP directly ?   Also, I did a lookup on dnsreport.com for the domain in question and the following came up:   "could not connect without GLUE or A Record"   What does this mean?   jeff