procmailrc.sample

:0
* ^List-Id:.*security.linux.kernel.org
* !^In-Reply-To:
{
    # 1. Create a clone of the message for the following block.
    :0 c
    {
        # 2. apply the filter to this copy.
        :0 fw
        | scripts/sec-process.sh

        # 3. Deliver the resulting summarized text to the mbox.
        :0:
        mbox
    }
}