[exim] Pipe message from filter to return header

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Author: Marc Perkel
Date:  
To: exim-users
Subject: [exim] Pipe message from filter to return header
OK - here's what I want to do - I want to run a program from the system
filter and return the results in a header - something like this:

headers add "X-Spamprobe: ${run {/etc/exim/scripts/spamprobe-test
$message_id}{$value}{}}"

However - I need to pipe the message into the program that I'm trying to
get the results from. How do I do the piping part?