Hi, i have set up the role on my 2003 server so thats its an email server, i set it up, now i send an email to the email of the email server, and it wont send :s, yet i have the mailbox configured :s
You need a public A-record and an MX record for your domain. You also need your mail services to be accessible through your firewall, and MS Exchange (or whatver email server you're using) needs to be setup correctly. Also, make sure the server is patched and (relatively) secure before it goes live. Open relay = very, very bad!