I guess that�s the problem. When I do the Reverse DNS Lookup for my IP at dnsstuff.com, I get the following answer:
myipaddress PTR record: IPDAEB0029ATL2.usa.prod.interland.net. [TTL 3600s] [BAD: No A record]
What that means is that you have the reverse DNS entry for the IP of your mailserver, but it doesn't resolve back to the IP of your mailserver. Specifically, you've got a reverse DNS entry of IPDAEB0029ATL2.usa.prod.interland.net, but IPDAEB0029ATL2.usa.prod.interland.net doesn't have an A record pointing back to the IP of your mailserver.
mydomain.com has an 'MX' record of imail.mydomain.com and an 'A' record of myipaddress. So should I just have Interland change the PTR record to mydomain.com?
That would work fine (and would probably be the best option, just to be safe).
Alternatively, they could add an A record for IPDAEB0029ATL2.usa.prod.interland.net. But given the funny looking hostname, there may be a couple people out there who would block it.
-Scott
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