Immediate NDR delivery failure

  • From: "Tom Avery" <tavery@xxxxxxxxxxx>
  • To: exchangelist@xxxxxxxxxxxxx
  • Date: Thu, 5 Sep 2002 06:53:39 -0600

Hello everyone, 

I have encountered a very unique situation. I am running exchange server 
5.5 with service pack 4. I am receiving the following error when my users
send email to one specific domain (in this case AOL). 

This is the error received, " The recipient was unavailable to take
delivery of the message "

What's interesting about this message, is that it is not DNS related. My 
server was an open relay, but that has been corrected and the server's IP
has been removed from all the DNS block lists around including AOL. I also
know it is not related to a full mailbox, as my users can receive email.
My users can send and receive email to everywhere else except AOL. Another
interesting thing, is when I examine the e-mail header on the returned 
message, it is blank (Listing no internet addresses or servers) which 
leads me to believe the problem is within the exchange server itself. 

Has any one ever experienced this??? If so, I would love to hear how you 
corrected it. 

Tom Avery 

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