Want to keep *some* duplicates

[Kirk Strauser]

For some reason, people now commonly reply to mailing list messages by 
directing them to the sender and Cc'ing the list.  This usually results in me 
only having one copy of the message: the one in my inbox, and not the one 
that's nicely threaded in the same folder as its references.  My copy of 
imapd.conf says that I have to leave duplicatesuppression turned on if I want 
to use Sieve - and I definitely want to keep Sieve around! - but I don't see 
any other clear ways to handle this.
-- 
Kirk Strauser