How to Create Email Addresses on a Domain With WordPress MU

1. Log in to the configuration control panel for the domain that your parent site is hosted on. For example, if you site uses cPanel as its configuration software, log in at yourdomain.com/cpanel.
2. Locate the “Mail” settings option, then click “Email Accounts.” In some cases you have to find and click an “Add New” link, while in others, such as cPanel, the options to create an account are available from this screen.

3. Type the name you want to give the email account in the relevant field. If creating the account for another person, ask her what she would like the account to be called. Type in a password in the password field. If you have the option, set a “Quota” for the mailbox to limit the size of the mailbox on your server space. Click “Create Account” when done.
4. Distribute the login details to the owner of the account. Send him his full email address, which is also his login username, his password and the URL of the mail server -- for example, “http://yourdomain.com:2096” in cPanel. He can change his password after logging in at this address, if he wishes.