Source Code For Berkeley Mail?

[Nan Wu]

I am posting this for a friend who cannot send mails because the system
manager doesn't want people to read messages and thus has disabled the
Berkeley "mail" program.  However, the sendmail daemon is still running.
His question is:  can he get the source code for the "mail" program so
that he can at least send out messages through sendmail daemon?  The
machine he is on is a Dec-station 3100 running Ultrix.  He'll appreciate
any pointers.  Please e-mail to this account.  Thanks!