I'm running Exchange 2003 server. Recently one of the users reported a following error;
'email@example.com' on 7/11/2006 3:50 PM
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<bbbnts.bbbntd.local #5.5.0 smtp;554 EMail from mailserver at 18.104.22.168 is refused. See http://spamblock.outblaze.com/22.214.171.124
I went to sorbs website and found out that our server is black listed with following reason;
Dynamic/Generic IP/rDNS address, use your ISPs mail server or get rDNS set to indicate static assignment.
We are behind a NAT firewall, adn bbbnts.bbbntd.local is hour internal host name of the server. Actual domain name is b3law.com
How do we resolve this issue?