Configuring Microsoft Outlook Express
From the "Tools" menu, select "Accounts".
Then, click "Add", then "Mail".
Then, provide the following information to the Internet Connection Wizard:

1: your real name (or a company name, etc.)

2: (eg.) jsmith@yourdomain.com

3: mail.yourdomain.com
4: mail.yourdomain.com

5: your user ID (eg. jsmith)
6: your e-mail password

7: My Email Account (or other "friendly" description of this email account)

Note: In most cases, you'll select "I will establish my Internet connection
manually."
For those who want Outlook Express to dial up automatically,
select "Connect using my phone line."