I have a problem with inbound delivery to our Exchange 2010 server after removing our Exchange 2003 server.
Prior to removal, all inbound emails were being pointed to our Barracuda and fwded to Exchange 2010 (was setup this way for about a week). Outbound email has no problems.
Right after the removal, I am getting this NDR from external senders and no inbound mail is being received.
Delivery has failed to these recipients or distribution lists:
An error occurred while trying to deliver this message to the recipient's e-mail address. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.
Diagnostic information for administrators:
Generating server: mail.domain.com
#< #5.0.0> #SMTP#
the error code doesn't really tell me much. What could be the problem here?