Have a DNS primary and secondary, which hold data for customers hosting domains and servers at my server farm. One customer has a Linux IIS server, which sends email too. I configured it's IP address at his domain for mail2 (A recored) and configured a reverse lookup for it too (xxx105, mail2.domain.com). If you check what is the mail2.domain.com you get the correct IP address, but the revers check return the same IP instead of the mail2...
Is it an improper configuration of the DNS server? a problem with it?
I disabled recursive updates as suggested by Microsoft to save load off the DNS server - could it be this?
I tried also running a test (from the DNS MMC on the server) and the basic and the second one failed - even though it seems that the DNS is functioning.
What else should I do in order for this mail server to be verified correctly at ISPs and emails from it be accepted??