no Authnticationmethode from outlook to Imap

Hello

Debian, with postfix and Dovecot Imap "2.2.13" running.

If I want connect from Outlook or Thunderbird I will become this error: Plaintext disalowd on non secure SSL/TLS Connection.

but I will that this run with secure connection, I don't have any intention to use Plaintext auth.

Also I don't know why, dovecot will switch from IMAP --> POP3-Login. Or it's this Outlook that will ask for it.

10-ssl.conf

            SSL = yes

10-auth.conf

disable_plaintext_auth = yes

Mail.log

pop3-login: Info: Disconnected (tried to use disallowed plaintext auth): user=<>, rip=IP, lip=ip, session=

Regards