I am hoping there is a simple solution to my problem. We are running the latest version of MS Exchange 2003 with all the updates behind a hardware firewall.

My company has a worker who works from home and he connects through an IMAP conncetion to our email server. Everything seems to work fine and he is able to recieve emails, check on contacts, see the daily tasks and so forth. He is not able to send email outside of our domain. Anything that is not addressed to another person in the office gets returned to him with the following error....

Your message did not reach some or all of the intended recipients.

Subject: test
Sent: 2/23/2006 11:24 AM

The following recipient(s) could not be reached:

'anonymous' on 2/23/2006 11:24 AM
550 5.7.1 Unable to relay for anonymous@***.com

It will always bounce back and never goes out unless he uses OWA. I am not sure why this is happening and was wondering what is causing it and how if possible how to fix it so that the emails will reach their destinations weather or no they are sent to people inside or outside our company. Perhaps there is a setting I need to change? or could it be the firewall that is blocking emails?