Check this out, it gives some clues:
http://www.dnsstuff.com/tools/dnsreport.ch?domain=paysonlinux.org

Nathan Aubrey wrote:

>I have been noticing more and more mail servers in the world will not accept 
>messages from my mail server. My mail server only accepts messages from the 
>local network, has a static IP, and yesterday I got the reverse dns setup.
>
>But is there something else that needs to be done so other mail servers will 
>accept messages from me? Such as AOL? Juno? Some AT&T servers...
>
>Is there a place to register a legitimate mail server or something? Or am I 
>left to contact all these places and inform them my mail server is legit?
>
>Nathan
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