I want to build a Windows 2003 E-mail server and use it for establishing e-mail accounts for my domain using the Pop3/SMTP E-mail service provided with the OS.
I have a Windows 2003 server, a domain name resolving to the ISP dynamic address (barely ever changes), and the POP3 service installed on the server. The internal LAN address is in a DMZ on my router and no software firewall is enabled. The server functions as a test web server just fine.
I'm a bit stuck on setting up the MX record via register.com and understanding how to route the e-mail to my private e-mail server appropriately. When I send an e-mail to snipped-for-privacy@mydomain.com, i get a smtp relay failure from my sending ISP (ie: at work). What am I missing? Do I have the neccesary resources at my disposal to make this work? Do I need to register my mail server with my ISP's DNS servers, or will register.com's DNS servers do that for me with the MX record?
I don't want to have to buy an e-mail account for my own domain through register.com