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I would like to know if there exists a solution for archiving email, stripping out the attachments and saving them separately, deduplicated?

The ideal would be a maildir-setup, with a script running over the messages, extracting the attachments, using e.g. hard links for existing/identical attachments, leaving a link/URL to the saved attachment left in the message.

Does anything like this exist, as scripts or anything that can be run on a linux server?

AFAIK Zimbra is set up similar, with a custom maildir+database backed storage, however, I would like something a bit more "transparent" for my archiving needs.

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up vote 2 down vote accepted

Dovecot does exactly this (Single Instance Storage) now with their dbox maildir format.

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but it is a planned feature and not currently available? –  grojo May 26 '11 at 18:52
    
It was introduced with 2.0.6 in Oct 2010 –  Hyppy May 26 '11 at 19:18
    
Ok, but is it ready for production? In the wiki (not updated) it says it's a "planned feature", in the announcement in Oct'10 it says "This feature hasn't had much testing yet, so be careful with it.". –  grojo May 27 '11 at 8:03
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