>The script seems to suggest that when postproc is invoked by whom,
>postproc will have an argument, "-when". But I can't find anything about
>that it 'man post' or in "man whom", so I am clearly confused.
I think you mean '-whom'. And yes, that is true. And yes, it's not
documented either; I learned that the hard way.
Traditionally there have been a lot of these "internal" switches used by
programs to pass down information between various (n)mh programs. We've
slowly been documenting them; we haven't got them all. There are also
a bunch of environment variables used; I think those are documented.
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