I have Exchange set up on an SBS 2008 Server. I can send email to anywhere external or internally other than any sbcglobal.net address. My clients immediately get an undeliverable message. The following is the message I receive:
Delivery has failed to these recipients or distribution lists:
The recipient's e-mail address was not found in the recipient's e-mail system. Microsoft Exchange will not try to redeliver this message for you. Please check the e-mail address and try resending this message, or provide the following diagnostic text to your system administrator.
Sent by Microsoft Exchange Server 2007
Diagnostic information for administrators:
Generating server: MyServer.DomainName.local
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##