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by foxcpp 1830 days ago
IMAP4rev1 is fully and almost [1] correctly implemented. There are some useful protocol extensions supported but some other important ones are missing (e.g. CONDSTORE).

There are no known issues with popular clients but performance may be a bit rough. Both due to missing extensions and storage implementation quality e.g. SEARCH may get slow for large inboxes.

[1] https://github.com/foxcpp/maddy/issues/188