mr.icn: Program to read mail

With no arguments, mr reads the default mail spool.  Another user,
a spool file, or the recipient for outgoing mail can be given as
a command line argument.  Help, including the symbols used to
indicate the status of mail, is available with the H command.

Usage:  mr [recipient] [-u user] [-f spool]

Configuration:

  Editor     for replies or new mail.
  Host       optional upstream routing address for outgoing mail;
             a domained Host is appended to the address, a uucp
             Host prefixes the address.
  Mail_cmd   the system mailer (usually sendmail, smail, or mail).
  print_cmd  command to format and/or spool material for the printer
             (for OS with pipes).  &null for ms-dos.
  ignore     a list of headers to hide when paging messages.  The V
             command views hidden headers.

Non-UNIX systems only:

  non_unix_mailspool  full path of the default mailspool.