(@pxref{Top,,MH-E,mh-e, The Emacs Interface to MH}).
@vindex mail-user-agent
+@findex define-mail-user-agent
You can choose any of these @dfn{mail user agents} as your preferred
method for editing and sending mail. The commands @kbd{C-x m},
@kbd{C-x 4 m} and @kbd{C-x 5 m} use whichever agent you have
@code{sendmail-user-agent} (Mail mode), @code{gnus-user-agent}, and
@code{mh-e-user-agent}. Additional options may be available; check
in the manual of your mail user agent package for details. You may
-also define another mail user agent using `define-mail-user-agent'.
+also define another mail user agent using
+@code{define-mail-user-agent}.
If you select a different mail-composition method, the information
in this chapter about the mail buffer and Message mode does not apply;