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Does an imap proxy with full message list and message body caching exist?

I see two possible variations, one with on-demand caching (user clicks on a mailbox and a message list is fetched from "master" and cached for next click from another mail client / webmail connected to the proxy. Same for clicking on a message with message body cache). Another variation is auto-fetch, some kind of script or daemon that fetches messages on background.

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up vote 2 down vote accepted

for the first variation (fetch on demand) have a look at the dovecot imapc backend:

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Thank you, is there something for the second variation? – Alex Dec 18 '12 at 7:34
there are a lot of scripts/daemons that download mail in the background which you could easily serve again with a local dovecot installation, but I'm not sure if that's what you want. , – Gryphius Dec 18 '12 at 8:58

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