WHEN SETTING IT UP FOR THE FIRST TIME:

Click on the Mail icon (it looks like a postage stamp).
The first time you use it, you will see a screen that looks like this:

If Mail has previously been configured:
For newer versions of Macintosh Mail: pull down File,
then select
New Account of Add Account.
If your version of Macintosh Mail doesn't have the option for
Add Account or New Account, pull down Mail, then select
Preferences. The Accounts screen will appear. Click the
+ sign in the lower left.
For Your Name, enter your name as you want it to appear in e-mail
messages. It's up to you what's entered here. Examples are: Jane
Doe; Jane; Jane D.; J. Doe, Sales Administrator; etc.
For Email Address, enter your e-mail address.
For Incoming Mail Server, enter pop.mm.com
For Mail Server Type, make sure the dot is next to POP.
For User Name, enter your 3-8 character username in all lower
case.
For Password, enter your 6-8 character password in all lower
case.
For Outgoing Mail Server, enter smtp.mm.com
NOTE: If you're accessing your mailbox from another ISP, that's
perfectly fine, but that ISP's rules apply when sending mail.
If you enter
smtp.mm.com but can't send mail, that ISP may allow you to use
smtp.mm.com if you change the outgoing port from 25 to 587. Or, that ISP may allow
you to use smtp.mm.com but with smtp authentication enabled. Or, that
ISP may require that you use their smtp server setting.
Click OK to save the information.