I'm trying to setup a linux machine as mail server and at this point the internal mail service it's already working, but when i try to send an message out of my company domain, it just don't go out. It could be a network configuration problem or a mail service configration problem? The rest of the services (internet browsing, telnet, ftp, etc.) are working fine (nternal and external). I check the routing table and it seem to be fine. The linux server it's behind a Microsoft Proxy server. Thank you.