I have a user that is trying to send an e-mail to xxxxxxxxx@sbcglobal.net and it won't go through. The person that he is trying to send it to sent him an e-mail (he received it fine) and the user just replied to it and it still won't work.
The NDR says "The message cannot be delivered due to a configuration error on the server. Please contact your Administrator. xxxxxxxx@sbcglobal.net... Addressee unknown, relay=[our external IP address]>
I also have a e-mail account at sbcglobal.net and I can send e-mails to it and receive e-mails just fine with my account. Is this a problem on our end? Any idea what setting would cause this? Why would it work for my account and not his?
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