To send mail to somebody with an MCIMail account, add "@mcimail.com to the end of their name or numerical address. For example:
555-1212@mcimail.com
or
jsmith@mcimail.com
Note that if there is more than one MCIMail subscriber with that name, you will get a mail message back from MCI giving you their names and numerical addresses. You'll then have to figure out which one you want and re-send the message.
From MCI, a user would type
Your Name (EMS)
at the "To:" prompt. At the EMS prompt, he or she would type
internet
followed by your Net address at the "Mbx:" prompt.