Failed sync with some imap server

Failed to sync with my email provider's imap/imaps server.

Even though the server address, login, password and port are correct, Dekko fails to sync (in either SSL or STARTTLS). Note that it did (and still does) work with Dekko 0.6.20.

After looking more closely, I think it's related to the authentification mecanism (PLAIN, LOGIN, ...). The server seems to only support something called "clear text" as a login mecanism.

So I guess this is more an enhancement request than an actual bug report: could whatever "clear text" is be implemented?

Environment: BQ E5 with Ubport.