"Address or Header Error-1"

Without provocation exmh started complaining like so:

    send: please re-edit draft to remove the ``X-Mailer'' header!

Whenever I press the "Send" button or "More... Whom".  Honestly, I 
didn't change a thing.

Does anyone have a clue as to how to fix this?  Help?

Thanks....

P.S.:	I composed this message in exmh, but had to edit the
	draft and send it with comp from command-line.

--
Kevin