i missunderstood or didnt clearly read the manual for managesieve.
Actually i have the courier imap, not dovecot.
I set in config.php the variable to 'no' but i still become in pluginmanagement the error "Ein unerwarteter Fehler ist aufgetreten: Plugin::RoundcubePlugins::_setRoundcubePlugin: The managesieve plugin require the Dovecot PO server".
How can i reconfigure the roundcube plugins? I cannot deactivate or delete the plugin because this error.
Of course i made the plugin-update in management.
in config.php of roundcube plugins the managesieve setting is set to "no" again.
BR
Dennis