I believe you'll find that more and more compainies will be utilizing the rDNS verification proceedures. This is not 'new' but rather being implemented quite fast amongs the top email systems such as AOL. Our company had the same issue sending mail to AOL and others until we begged our ISP to add the rDNS records. After about 2 weeks and many calls they finally broke down and added the rDNS for our block.
Which brings me to this juncture: Why wouldn't anyone add the rDNS to there records?
There's a LOT of confusion here, and mis-information spreading. To summarize:
1. REQUIRED: A reverse DNS entry
2. IMPORTANT: The host name of the reverse DNS entry has an A record that points back to the same IP
3. NOT IMPORTANT: The actual host name in the reverse DNS entry
In this case, he has #1 and #2, but not #3. That's fine.
For example, if your mailserver is named mail.example.com at IP address 192.168.1.1, then [1] 192.168.1.1 needs to have a reverse DNS entry (which could be mail.example.com, some_other_host.example.com, or host.other_domain.com), [2] Assuming that the reverse DNS entry for 192.168.1.1 points to host.other_domain.com, then host.other_domain.com should have an A record pointing back to 192.168.1.1, [3] host.other_domain.com does NOT have to match mail.example.com.
-Scott
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