From Microsoft Outlook 2003 click on Tools.
Click on E-mail Account ...
Then please check Add a new e-mail account.
Then select POP3.
Please fill it with the details of your domain name (Your Name: My Name, E-mail Address: info@mydomain, incoming mail server (POP3): mail.mydomain, Outgoint mail server (SMTP): mail.mydomain, User Name: info@mydomain, Password: my secret password.)
Then click on More Setting ..
Please writ your full email address (info@mydomain) then click on Outgoing Server.
Please check on My outgoing server (SMTP) requires authentication then click on Advanced.
Please check Leave a copy of message on the server (that will help you to save one copy of all your email at your server) then click OK.
Then click to Next.
Now click Finish. There you done to setup your email address in Microsoft Outlook.