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Page 16: CMU Cyrus features
Runs on top of Unix rather than integrating with it.
does its own authentication and quota handling
Heavy use of databases
-- admin done with special tools and extended IMAP
Concurrent access makes efficient IMAP-based biff-alike possible.
Indexes similar to those we have added to UW-IMAP.
-- full text index new feature for us
-- 200,000 messages per second better than grep!
Data in wire format on disk
-- heavy use of mmap for reduced copying
-- a link to the same file for each folder a message appears in
-- Message-ID:-based duplicate suppression
courier doesn't have indexes
dovecot doesn't have shared mailboxes or maildir++ quotas
both perpetuate scruffy layering violations
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