The SMTP server here is working in the following ways: A. I can send receive email to/from the outside WAN B. I can send receive email to/from anyone on the inside LAN However when I telnet locally to the SMTP server and do the following: HELO domain.com MAIL FROM: username1@xxxxxxxxxx (receive the correct response... Sender OK) RCRT TO: username2@xxxxxxxxxx (receive incorrect response.. Only get usersname2@domain as the responses no ..Receiver Okay) Data Subject: test Test Test . (to exit) Server reports its being qued Quit SMTP logs show all the activity I just showed you, however the TEST email never gets to its destination, infact I have yet to receive it at all since yesterday. We also have a Xerox WorkCentre Pro 55 with the email option, and it only works through the SMTP server, it too has the same problem were it sends it out but nothing goes anywhere via the local SMTP server. I also wondered if ISA 2004 Server plays any role in this? Even though it's kind of odd that I can telnet into the Exchange server from any local machine. I am open to suggestions. Thanks Andrew