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Can not send to any SBCglobal email address

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:

'********y@sbcglobal.net'
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

*******@sbcglobal.net
#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found ##

Rick Fee

The problem whatever your server is hitting does not have the emails your attempting to send to:

#550 5.1.1 RESOLVER.ADR.RecipNotFound; not found

Mailroot

http://social.technet.microsoft.com/Forums/en-US/exchangesvrmigration/thread/c4aedd66-cd02-4c7d-b4a8-d8711138e395

-Ethan

Alan Hardisty

SBCGlobal use multiple servers to receive their mail, and it is most likely that you are hitting one server that is not configured properly:
Your 9 MX records are:

10 sbcmx1.prodigy.net. [TTL=7200] IP=207.115.21.20 (No Glue) [TTL=7200] [US]
10 sbcmx2.prodigy.net. [TTL=7200] IP=207.115.20.21 (No Glue) [TTL=7200] [US]
10 sbcmx3.prodigy.net. [TTL=7200] IP=207.115.21.22 (No Glue) [TTL=7200] [US]
10 sbcmx4.prodigy.net. [TTL=7200] IP=207.115.20.23 (No Glue) [TTL=7200] [US]
10 sbcmx5.prodigy.net. [TTL=7200] IP=207.115.21.24 (No Glue) [TTL=7200] [US]
10 sbcmx6.prodigy.net. [TTL=7200] IP=207.115.36.20 (No Glue) [TTL=7200] [US]
10 sbcmx7.prodigy.net. [TTL=7200] IP=207.115.37.21 (No Glue) [TTL=7200] [US]
10 sbcmx8.prodigy.net. [TTL=7200] IP=207.115.36.22 (No Glue) [TTL=7200] [US]
10 sbcmx9.prodigy.net. [TTL=7200] IP=207.115.37.23 (No Glue) [TTL=7200] [US]
It could also be at your end and a quick read of my article and a check of your server config / blacklist check will hopefully come back clean:
https://www.experts-exchange.com/articles/Software/Server_Software/Email_Servers/Problems-sending-mail-to-one-or-more-external-domains.html

ereichelrcs

ASKER

I'm not sure how I can test if one of those 9 servers aren't configured properly. I have checked, I am not blacklisted. Any other thoughts?

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Alan Hardisty

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ereichelrcs

ASKER

ATT admits a problem on their server. They are taking the appropriate action to solve the issue.

Alan Hardisty

Good news - I thought the problem was external to you.