Package uidplus DOES NOT implement full RFC4315! Excluded parts are: * Response `UIDNOTSTICKY`: All mailboxes of Bridge support stable UIDVALIDITY so it would never return this response Otherwise the standard RFC4315 is followed.

NewIMAPBackend returns struct implementing go-imap/backend interface.

NewIMAPServer constructs a new IMAP server configured with the given options.

Cache keys.

Server takes care of IMAP listening serving.