Setting Up Outlook Express for POP a/cs
Step1:

Open Outlook Express, go to Tools / Accounts...
Click on the Mail tab.
Click on the Add Button, click on Mail...
A new window should pop up like the one below. Type in the name you want to be displayed for your e-mail address. Click on the Next > button.

Type in your e-mail address, normally, yourusername@domain.com, but anything@domain.com will work. Click on the Next > button.

Select POP3 in the drop down menu is not currently selected. Type yourdomain.com in the Incoming mail text box. Type your local ISP's SMTP address in the Outgoing mail text box. Click on the Next > button.
Type your username in the username POP account name text box. Type your password in the Password text box. Click on the Next > button.
Make a friendly name for this mail account. Such as domain.com's Emails... etc. Click on the Next > button.
Choose your Internet connection type, you should be able to get away by choosing Connect using my local area network, if you don't know what to choose. Click on the Next > button.
Click on the Finish button. You are no ready to download and send mail.
Finally, close the Internet Accounts window.
Step 2:

You may want to see if the settings are ok. A typical setting should like this. (When you click on the mail TAB and the Properties Button and then again on Server tab, you could verify the settings.)

Step 3:

Once you have the account set up, you will want to make sure that it is working properly. To do this, send a test message to yourself or a friend. Give the message a few minutes and then check to see if it has arrived. If your email does not appear to be working, you may want to contact technical support.