Login credentials sent via the LOGIN command.
Remote IMAP host.
OptionalportRemote port; defaults to 993 (implicit TLS).
OptionaltimeoutPer-operation read deadline in milliseconds.
OptionaltlsTransport security:
'implicit' (default): TLS from the first byte (IMAPS, port 993).'starttls': plaintext, upgraded with the STARTTLS command (port 143).
Options for connect and fetchRecent.