I think the simplest thing to do would be to write a custom postproc
and use it to interrogate the draft (using scan(1)) to make sure it was
the way you want. Like if the To: line was blank, exit with a sensible
error message. If you were happy with it, call the real post.
I've attached the sample postproc I put in the nmh contrib directory;
it's job is to change the switches to post depending on the from line,
but you could use it to see if there's something in the To: header.
Would you be willing to tell me how, in such a script, I could detect the
presence or absence of a specific header, say "Exception: norm"? (I don't
intend or want to enter the currently raging header debate. I'm just asking a
specific technical question.)
Norman Shapiro
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