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[vox-tech] procmail question: filtering message mangles headers
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[vox-tech] procmail question: filtering message mangles headers

I have the following procmail recipes to create a makeshift mailing list:

* ^To:.*m10-update
* !^X-Loop: m10@houseag.com
* ^Received: from wotan.hajhouse.org   # accept messages from my host only

      | sed -e 's/^Subject: /Subject: \[M-10\] /'

      ! `$HOME/_sendmails`

The first recipe in the bracketed block archives to a mailbox and the third
forwards the message to the list of addresses produced by the script

The second recipe is supposed to tag the subject header of incoming messages to
make them easy for their recipients to identify, just a many mailing lists do.
It does not work! Instead the messages are mangled---the subject is completely
blank and the To: and From: headers are re-written. This does not happen when I
comment-out the second recipe.

Offhand, I see no reason for this difference in behavior either in the recipes
or in the logfile. Clearly I am missing some subtlety. Can anyone enlighten me?

Henry House
Please don't send me HTML mail! My mail system will reject it.
The unintelligible text that may follow is a digital signature.
See <http://hajhouse.org/pgp> to find out how to use it.
My OpenPGP key: <http://hajhouse.org/hajhouse.asc>.

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