Mail Services enables you read mail that other users sent you.
It also enables you to send mail to other users.

The items on the Mail Services menu are:

      New Mail:  Lists the messages that other users sent 
      you.  The screen clears and your mail messages are 
      listed in chronological order by the mailx command. 
      Type the number of the mail message you want to read.  
      Type "q" to quit and return to the interface. Type "?"
      to get help.

      Send Mail: Enables you to send mail to users on this
      system and other systems.  You will be prompted for 
      the user login(s) and, after you press SAVE, the
      screen will clear, and then you can type your message.
      Type "~." to end the message and return to FACE. 
      Type "~?" for help.

      The login(s) that you enter as mail destinations are
      only validated after you complete your mail message.
      If you have specified any invalid mail destinations,
      a frame will open on the display that contains all of
      the invalid destinations.  At this point, your mail
      message has only been sent to those destinations that
      were valid.  You must re-enter the correct version of
      any invalid destinations and re-enter your mail message
      to send mail to these destinations.