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Can I use MySQL (or another SQL database) as the primary mail store?
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Using a database as the main message store for Cyrus is not currently
supported. According to discussions on the mailing list, there is little
benefit in adding such support (given typical IMAP access patterns,
optimizations in the current mail store that make it fast, and the
amount of effort involved to retrofit a different mailstore into the
backend), so it's unlikely to ever be written.
The Cyrus mail store is a normal directory tree, with mailboxes stored
as directories and messages stored as individual files. Some additional
information, eg index data, is kept in the "cyrus.*" files in the
mailboxes.
Cyrus DOES have the option of using databases of various types for
storing some other information, such as authentication data, mailbox
lists, etc. There may be reasons to add a SQL backend to these databases
in the future (in addition to flat, and skiplist).
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