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Add JMAP support (as an alternative to IMAP + SMTP) #5918
"JMAP is intended to be a new standard for email clients to connect to mail stores. It therefore intends to primarily replace IMAP + SMTP submission. It is also designed to be more generic such that it can be extended with contacts, calendars in the future (replacing CardDAV/CalDAV). It does not replace MTA-to-MTA SMTP transmission."
About the JMAP working group at the IETF: https://datatracker.ietf.org/wg/jmap/about/