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- make SSL certificate validation more automatic.
- add deamon mode. primary goal: keep imap password in memory.
- add asynchronous operation to remote mailbox drivers. this is actually
- what prevents us from simply using c-client and thus becoming mailsync.
- handle custom flags (keywords).
- fix maildir_{open_store,list} to handle partial names (last char not slash).
- add a way to automatically create and sync subfolders.
- could store TUID even when UIDPLUS is supported. would avoid duplicated
- messages after abort before new UID arrives.
- decouple TUID search from append. that's a prerequisite for usable
- MULTIAPPEND, and is generally good for async. should be way faster, too,
- as it saves repeated mailbox rescans with single-file formats.
- use MULTIAPPEND and FETCH with multiple messages.
- create dummies describing MIME structure of messages bigger than MaxSize.
- flagging the dummy would fetch the real message. possibly remove --renew.
- don't SELECT boxes unless really needed; in particular not for appending,
- and in write-only mode not before changes are made.
- possibly request message attributes on a per-message basis from the drivers.
- considerations:
- - record non-existing UID ranges in the sync database, so IMAP FETCHes needn't
- to exclude anyway non-existing messages explicitly.
- - when detect unborn pairs and orphaned messages being gone? implied by expunge:
- with trashing, by local driver, or of messages we deleted in this run. the
- remaining cases could be handled by automatic periodical cleanup passes, an
- explicit --cleanup action, or be implied by one of the other actions.
- - the benefit of this is questionable, as fine-grained requests will result
- in sending huge amounts of data, and upstream is often way slower than
- downstream.
- maildir: possibly timestamp mails with remote arrival date.
- maybe throw out the ctx->recent stuff - it's used only for one info message.
- possibly use ^[[1m to highlight error messages.
- consider alternative trash implementation: trash only messages we delete,
- and trash before marking them deleted in the mailbox. downside: all other
- programs have to do the same. and what if the deleted flag is unset?
- items out of scope of purely UID based approach:
- - detect message moves between folders
- - recovering from UIDVALIDITY change (uw-imap < 2004.352 does this a lot)
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