If you want to check your spelling in your message before sending, use
mh-before-send-letter-hook like this:
Spell-check message via mh-before-send-letter-hook
(add-hook 'mh-before-send-letter-hook 'ispell-message)
In case the MH send program is installed under a different name,
use mh-send-prog to tell mh-e the name.
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