To use another text editor when editing your mail messages,
from the Preferences menu,
then make your selections:
Enter the command used to invoke the editor under
``User Specified Editor''.
If necessary, include a full pathname
(for example, /usr/bin/vi).
You must be able to invoke this editor with the syntax:
where filename is the file you want to edit.
Select Run editor in a terminal window,
unless the editor is a graphical editor that will
open its own new window when invoked.
If you want this editor to be invoked by default whenever
you have text to edit (when creating a message or when you
click on an Edit button), select
Set as default editor.
If you do not do this, the editor will not be invoked
unless you select Editor from the Message window