Making Mutt Useful Offline

I've been using mutt as my MUA for over 8 years now. Long ago I would ssh to my server and run it on local Maildirs, but as soon as I started using smartphones and multiple computers I had to switch to an IMAP+SSL setup. Mutt's header_cache option has long made accessing large mailboxes snappy, and the recent message_cachedir option available in 1.5 makes browsing through messages with attachments equally snappy over IMAP.

A useful side effect of message body caching is that it provides an offline copy of entire mailboxes which get synchronized automatically and can easily be read in Mutt as a local mailbox… well, almost.

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