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f{,data}sync() usage could be optimized by batching the calls.
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make SSL (connect) timeouts produce a bit more than "Unidentified socket error".
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uidvalidity lock timeout handling would be a good idea.
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add message expiration based on arrival date (message date would be too
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unreliable). MaxAge; probably mutually exclusive to MaxMessages.
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add alternative treatments of expired messages. ExpiredMessageMode: Prune
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(delete messages like now), Keep (just don't sync) and Archive (move to
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separate folder - ArchiveSuffix, default .archive).
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kill the concept of an INBOX, it is a relic from single-channel operation.
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if somebody needs it, he can have two stores with different Paths. the path
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can name a single (in-)box (curr. broken with maildir). an empty box name
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actually means empty, so the IMAP mailbox should use INBOX for Path (can't
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make that the default, as it would mess up the NAMESPACE).
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add regexp-based mailbox path rewriting to the drivers. user would provide
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expressions for both directions. every transformation would be immediately
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verified with the inverse transform. PathDelimiter and Flatten would become
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special cases of this.
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add daemon mode. primary goal: keep imap password in memory.
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also: idling mode.
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parallel fetching of multiple mailboxes.
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imap_set_flags(): group commands for efficiency, don't call back until
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imap_commit().
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add streaming from fetching to storing.
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handle custom flags (keywords).
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make use of IMAP CONDSTORE extension (rfc4551; CHANGEDSINCE FETCH Modifier);
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make use of IMAP QRESYNC extension (rfc5162) to avoid SEARCH to find vanished
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messages.
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use MULTIAPPEND and FETCH with multiple messages.
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create dummies describing MIME structure of messages bigger than MaxSize.
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flagging the dummy would fetch the real message. possibly remove --renew.
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note that all interaction needs to happen on the slave side probably.
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don't SELECT boxes unless really needed; in particular not for appending,
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and in write-only mode not before changes are made.
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problem: UIDVALIDITY change detection is delayed, significantly complicating
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matters.
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possibly use ^[[1m to highlight error messages.
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consider alternative approach to trashing: instead of the current trash-before-
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expunge done by mbsync, let MUAs do the trashing (as modern ones typically do).
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mbsync wouldn't do any trashing by itself, but should track the moves for
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optimization. additionally, there should be a mode to move trashed messages to
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the remote store. TrashMode Internal|External, AbsorbRemoteTrash.
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a yet different approach to trashing is treating the trash like a normal mailbox.
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however, this implies a huge working set.
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consider optional use of messages-id (and X-GM-MSGID):
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- detection of message moves between folders
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- recovery from unmotivated UIDVALIDITY change, or total loss of sync state
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