This is the first time we have setup a Microsoft SBS 2008 with Exchange 2007. We have the box working fine as the domain controller and have been sending and receiving emails just fine, until someone tried sending to ATT. We were rejected due to the following:
The following organization rejected your message: nlpi078.prodigy.net.
Sent by Microsoft Exchange Server 2007
Diagnostic information for administrators:
Generating server: blackpearl.localdomain.loc
nlpi078.prodigy.net #553 5.3.0 nlpi078 - n6F1QFv3010006, DNSBL:ATTRBL 521< 216.xxx.xxx.xxx >_is_blocked.__For_informa
Original message headers:
Received: from blackpearl.localdomain.loc
1%10]) with mapi;
Tue, 14 Jul 2009 20:26:13 -0500
From: bangroot <email@example.com
To: User <firstname.lastname@example.org>
Date: Tue, 14 Jul 2009 20:26:11 -0500
Now I have checked the blacklist for my IP address and all is well. I am confident it has to do with my exchange server broadcasting the internal domain name rather than the external domain. I have gone into the exchange server and set the default exchange domain to be the external domain. I have gone into the Send Connector and made sure the FQDN matched my reverse DNS on the public IP.
I am doing remote DNS for the Internet domain, and pointed the MX record to the public IP address of the Exchange server. I can't seem to get the exchange server to change the sending domain name from blackpearl.localdomain.loc
l to blackpearl.internetdomain.