Leave the button "I already have an e-mail address that I'd like to use" checked and enter the full address of your email account.
This will be your username@mcis.us

Click Next. The following box appears:

In the "Incoming mail (POP3, IMAP or HTTP) server" field enter : mail.mcis.us
Don't enter your domain name or add www's or anything.
In the "Outgoing mail (SMTP) server" field enter : mail.mcis.us

Click Next. The following box appears:

In the "Account name" field enter the username of the person you want to check email for.

In the "Password" field enter the password for the user. This is the password of a mailbox you created in your control panel.
(Remember that passwords are case-sensitive!.)

Click Next. The following box appears

Click Finish. Your Outlook / Outlook Express email configuration is now complete.

You may need to restart Outlook /Outlook Express before you can start sending and receiving email.

You will have to open Outlook Express, click on Tools and then choose Accounts. On Mail Tab click properties then the server tab. Check the box beside My Server Requires Authentication then click apply