*** The key C-x m no longer runs the `mail' command directly.<BR>
Instead, it runs the command `compose-mail', which invokes the mail
composition mechanism you have selected with the variable
`mail-user-agent'.  The default choice of user agent is
`sendmail-user-agent', which gives behavior compatible with the old
behavior.
<P>
C-x 4 m now runs compose-mail-other-window, and C-x 5 m runs
compose-mail-other-frame.
<P>