Resolved How to fix plesk's dovecot?

[Tim Gerdes]

Hi guys,

my mailserver stopped working. Since I know Plesk not yet well, I tried to install Sieve manually. Here I have apparently reconfigured a part of Dovecot. Since then it is no longer possible to log in to the mailserver. The following error occurs in mail.log " Unknown passdb driver 'plesk' ".
I have no idea how I can fix the error.