[Dovecot] On-delivery deduplication?

[Willie Gillespie]

This has been quite an informative topic, although it veered from the 
initial question quite early on.

I know Dovecot does not do deduplication on its own, but perhaps someone 
can point me to a good Maildir deduplication program.  In my case it has 
nothing to do with mailing lists.  We have a shared namespace for 
certain groups where multiple people can put email regarding certain 
projects.

Naturally, sometimes two people receive the same email and they will 
both go put their copy in the same folder.  It'd be nice (not critical) 
if I could remove the duplicates somehow.  Obviously they are not 
byte-for-byte duplicates because their headers are going to be 
/slightly/ different near the end of the Received sequence.

Willie