Error from DNS validation service: RFC821 4.3

Posted by ferdi on Server Fault See other posts from Server Fault or by ferdi
Published on 2010-05-13T02:58:45Z Indexed on 2010/05/13 3:04 UTC
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dns

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mail

So I've managed to setup bind9 and a mail server, but it seems there is something wrong. I don't quite under stand this error:

The configuration of your mail servers and your DNS are not ok! The report of the test is: 
mail.domain.com. -> mail.domain.com -> 208.xxx.xxx.xxx -> lisa.domain.com
Spam recognition software and RFC821 4.3 (also RFC2821 4.3.1) state that the hostname given in the SMTP greeting MUST have an A record pointing back to the same server.

Can anyone explain this to me in a bit more detail, and maybe point me in a direction to solve this?

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