Using SBS2003 server.
Location with around 40 users. Email system has been working fine for a year. Suddenly only one user account can't receive email from outside sources. He can send ok, He can receive internal emails ok, but nothing makes it in from the outside. All other users can receive outside email ok. The emails do not reject back to the sender so I have no tracking or troubleshooting paths to follow.
I tried stopping and restarting Exchange services. I then tried a complete server reboot. No help.
Any insight would be appreciated!