Here is the exact message I receive:
Unable to deliver the message due to a message transfer failure. Check the
recipient address and try again or contact your system administrator.
dns;citadel.innerbase.com failed 5.0.0
> We are running exchange 2000 on win2000 server, and everything was working
> fine until yesterday. Now we can no longer send mail, although we can
> receive mail. When we attempt to send mail we are getting an error (in
> outlook) that says the server cannot route the message - we know our DNS
> working fine, we can send mail off unix boxes on the same network without
> any problem
> Besides the obvious - we are looking into reloading the exchange
> is there any other possible issues we should be looking at that might
> this to happen?
> Thanks in advance.