We're running Active Directory on Windows 2003 Servers. 99% of the time, all is well. Occassionally we seem to be pulling erroneous MX information. When I do an nslookup type=MX from the Imail server, I get the correct information... most of the time. The erroneous server is always another server that's located at the provider for the company in question. I check their DNS server and can find no problems...
I even had one where we'd apparently come up with the IP of an internal POP server for earthlink, instead of one of their outward facing MX servers....
Given what you describe, it sounds like IMail is getting the A record rather than the MX record. However, if this is the case, the "nslookup type=MX" should always produce the correct results. Specifically, if the MX record doesn't exist, IMail tries the A record (per the RFCs).
Note that if you have more than one DNS server listed in the IMail SMTP settings, you should remove all but one. Otherwise, if the primary DNS server is failing, when IMail sees the failure for the MX record, it could cause IMail to switch to the secondary -- which will report the correct A record (which is not what you want).
-Scott
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