I am running Exchange 2003 on windows 2003 server. Mails are sent from our server to our spam server (Interscan messaging Trend). The problem is that some emails are being held in the retry queue because of a message saying RDNS failed. The exact message is below
from dubex2003.cognotec.com ([10.152.25.90]RDNS failed) by
and the log says DNS query or connect server fail. no branch
This only happens on some emails, and I can verify the sender and recipients email address is correct.
any help on this would be great.
thanks very much