My experiments indicate that mh-format, at least as applied to scan, does not
distinguish between a header with zero length content and a non-existent
header. Am I correct? I can't find any documentation saying that.
Maybe there is a standard that says that all components must have or should
have a content (what RFC 5322 calls a field body) of positive length.
In any case, is there a workaround that would let me write a format that would
treat a message with a component like
Foobar:
differently from a message without a "Foobar" component -- maybe some
legerdemain like appending 'X' and asking if the result is equal to 'X'.
I might note that
pick --Foobar ''
Selects messages having a foobar component, with or without non-empty content.
Norman Shapiro
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