mail, rmail—reads mail or sends mail to users

Sending mail

   mail [ –tw ] [ –m message_type ] recipient...

   rmail [ –tw ] [ –m message_type ] recipient...

Reading mail

   mail [ –ehpPqr ] [ –f filename ]

Forwarding mail

   mail –F recipient...

Debugging

   mail [ –x debug_level ] [ other_mail_options ] recipient...

   mail [ –T mailsurr_file ] recipient...

A recipient is usually a username recognized by login. When recipients are named, mail assumes a message is being sent. It reads from the standard input up to an end-of-file (Ctrl-D), or if reading from a terminal, until it reads a line consisting of just a period. When either of those indicators is received, mail adds the letter to the mailfile for each recipient.