Yours truly suggested to Bart Schaefer,
This might work:
* ? formail -iMessage-Id: -R List-Post: Message-Id: | \
formail -D 1024 listpost.cache
It did in my test just now, but so did this,
* ? formail -iMessage-Id: -R List-Post: Message-Id: \
-D 1024 listpost.cache
One fork, no shells. Actually, I tried it with From: instead of
List-Post: because From: gave me a much larger sample to work with, but
surely it would do for List-Post: just as well.
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