how i make simple mail server

hi,
i am make simple form of " Contact us " to receive emails from users but i want to know how i make simple mail server to receive mails or what is the key to search about this topics ans what is the methodology which are used in real world?

Windows 2003 server shipped with a POP3 SERVER - search with
google using these keywords.

Once it is configured you can use this as mail server(max 50 users, I think so)

Thanks , but to make limitation is not good so i found services in sql which is called SQl Mail , so what is ur opinion about it ?

using win 2003 POP3 service is far bette than SQL mail.