I have an Microsoft 2003 SBS R2 server with 14 users. I have 2 other users that are not part of the SBS and will never be part of it but are on the same LAN as the other 14. The problem is these 2 users have the same domain for email, ourdoman.com, as the other 14 sbs users. I have these 2 users setup on a POP3 server externally, outside of the SBS. The can send and recieve external email with not problem. The only problem is when the 14 SBS users send an email to the 2 non SBS users, they get the following error message: "The email account does not exist at the organization this message was sent to. Check the email address, or contact the recipient for correct address." Of course this makes sense because the 2 users are not in AD of the SBS. I am wonder how, if possible, to route the 2 user outbound mail to the external POP3 server. Does anyone have any ideas and a procedure to do so?