On 2012-04-12 at 19:30 +0000, Grant Edwards wrote:
> IIRC the procmail delivery line just called formail and passed
> it the -I option with the new subject line (created with sed
> probably).

After unfolding and decoding the header fields to UTF-8 I pipe
the message through sed directly.  For example the sed command
for the list notm...@notmuchmail.org would look like this:

    sed '1,/^$/ { /^Subject:/s/\[notmuch\][[:space:]]*//g }'

Just in case someone might be interested...

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