If you experience an error message like "No supported authentication methods" found while you are adding a new mail account please check if you have allowed one of the supported authentication methods on your server.
Supported SMTP/IMAP authentication methods:
- DIGEST-MD5
- CRAM-MD5
- LOGIN
- PLAIN
- XOAUTH2
Supported POP3 authentication methods:
- DIGEST-MD5
- CRAM-MD5
- LOGIN
- PLAIN
- APOP
- USER