Hello All, I just installed exchange server 2003. I want this server to send/receive messages from my outside email host. Right now i'm able to send messages, but not receive it. My guess is that my domain name is "123.company.com", and my domain name at outside email host is "company.com" . What setting should I use in exchange server to be able to receive messages using this sort of architecture: outside mail provider - exchange server 2003 - mailuser.

You'll need MX records configured on external DNS servers that point to the Exchange server for inbound SMTP delivery. Has this already been configured properly?