Here is given the description of Outlook Express 5.0 setting, the setting of previous versions don’t differ. Check "Accounts..." item in "Tools" menu. Check "Mail" tub in appear "Internet Accounts" window (see the picture).

Check account which you want to configure for working with AEP and press "Properties" button. If you have a number of accounts for mail and want to configure they all for working with ADR then you have to execute the following operation several times. Check "Servers" tub in appear "account name Properties" window. Replace "Incoming mail (POP3)" address for 127.0.0.1 and "Account name" with john/pop.mail.yahoo.com (see picture below). Press "Apply" button and that is all!