IMAP4rev1 is fully and almost [1] correctly implemented. There are some useful protocol extensions supported but some other important ones are missing (e.g. CON

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 https://github.com/foxcpp/maddy/issues/188