1. My rainloop was showing the message, can't connect to the server.
2. The dovecot service status was returning the error: Unknown setting: managesieve_max_line_length
3. I reinstalled dovecot and returned to work, but I still can't access the rainloop, now it shows the error, authentication failed.
4. In cyberpanel, I did> E-mail, List E-mails> fix SSL and SSL> Mailserver SSL, restarted the server and still can't access it.
5. In Outlook, I can't access it either.
6. I have 5 servers with cyberpanel and I am being forced to give up using it due to the recurring problems with emails.