From: Jorey Bump (listjoreybump.com)
Date: Sun Jul 02 2006 - 22:26:34 CDT

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mouss wrote:
> Jorey Bump wrote:
>> Cyrus doesn't use maildir, but it does store each message as a single
>> file.
> This is ambiguous. afaik, cyrus stored many messages in a single file,
> but uses an index file to "reach" messagesmore quickly than if just
> using mbox format.

No, it stores each message as a single file. From the documentation:

message files
     There is one file per message, containing the message in RFC 822
     format. Lines in the message are separated by CRLF, not just LF.
     The file name of each message is the message's UID followed by a
     dot (.).

Since each file is a raw RFC 822 mail message, it relies on support
files to index and provide other information about messages and
mailboxes (the directories that contain messages).

Dovecot uses separate index files to enhance access to multiple messages
in single mbox files, as you describe.

> anyway, given OP's questions, he should go dovecot or courier.

Perhaps. His original question was simply a survey. Unfortunately, the
choices are few, they all have significant caveats, and all represent a
commitment that's difficult to reverse. Sadly, there is no true blackbox
solution for IMAP, even from a user's point of view.

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