MM has a long history, and the UNIX version was written here at Columbia University in 1986. The MM Home Page has full details. MM has a command-based interface more similar to the UNIX shell than Pine is. This is slightly harder to learn at first but allows faster movement once you know the commands you want. MM has a lot of built-in help to show what the commands are and what they do.
Suggestions are also welcome.
Some commonly used commands are shown here. See help for more. The command send starts a sequence in which you can write and send a message. First you are prompted for the To , Cc , and Subject lines, and the message itself, and then you are put in Send Mode where you can give additional commands and either send the message or quit back to Top Level. Bla bla bla.