Debugging rules with Pigeonhole Sieve

[Pete Gonzalez]

I have a lot of rules in my Sieve script.  Sometimes an email message 
ends up in the wrong folder, due to a problem with one of the rules. 
However, this is very difficult to debug, because I have no idea which 
rule matched the email.

A log file might be helpful, but that wouldn't be readable without shell 
access to the mail server.  This is not a solution that would work for 
everyday users, who configure their rules via a web page UI.

What would be great would be for the Sieve interpreter to append a 
custom header to each email message after it gets processed.  This 
header would record which Sieve rules matched the email.

Does this feature exist already?  Or is there a way to accomplish it via 
the Dovecot server configuration?  Thanks!
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