search for: fqdn_of_dovecot_certif

I have tried all the suggestions up till now but the error message is still there. I have tried this configuaration for roundcube: $config['imap_conn_options'] = array( 'ssl' => array( 'peer_name' => '<FQDN_OF_DOVECOT_CERTIFICATE>', 'verify_peer' => true, 'verify_depth' => 3, // 'cafile' => '/dont/need/to/set/this/option', ), ); and this one: $config['imap_conn_options'] = array( 'ssl' => array( 'verify_peer' => fal...

I think that you are right when you say that the problem may be the certificate recognition. As for Roundcube, I've inserted the uncommented php code that you provided in /usr/share/roundcube/main.inc.php.dist, which is the Raspbian file for /config/defaults.inc.php. Unfortunately Roundcube doesn't login and replies with the message "connection to storage server failed". And