on 2012-01-10 13:06 Nathan Sims wrote
I have an IMAP email account, and in Mail -->  Preferences -->  Advanced it has 
this option:

   Keep copies of messages for offline viewing:
       - All messages and their attachments
       - All messages, but omit attachments
       - Only messages I've read
       - Don't keep copies of any messages

How does this work? Does setting it to "All messages and their attachments" 
cache all of my emails on my local machine?

yes it does; i'd call it better than a cache — it's complete maildir archive stored in ~/Library/Mail (at least on 10.5), and it is indexed by Spotlight

i rely on this Mail behavior to back up my email traffic, even though i use Thunderbird for interactive email
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