To edit a message you are creating, press <Esc> and select Edit from the Create menu to start the editor program configured for your account. Exit the editor using its normal quit command.
You can edit a message using a text processing program other than the editor built into SCO Shell Mail.
To define a different standard editor, select:
from the Mail menu.
Move the highlight to the Mail Editor line, and change the pathname for the editor program to the one you want to use. Ask your system administrator if you do not know the pathname of the editor program.