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Page 20: POP and IMAP proxy
Murder of IMAP servers -- "cool for crows"
-- allows us to use lots of small message stores
rather than one big monolithic one
Cyrus proxy continues to track connection after authentication
-- knows which back-end has which mailbox
-- cross-cluster shared mailboxes
-- we don't use it because it was too immature at the time
Also important for migration (explained later).
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