If you have installed Kolab 3.2 on Debian Jessie and if you are using SSL, you might have problems with sieve-filters. If I click on Filters(in webmail), I’ll recieve the following error: “Unable to connect to server”. /var/log/mail.log shows me:
Sep 18 11:45:35 kolab sieve[3936]: STARTTLS failed: localhost [::1]
I solved that problem by adding the following lines to /etc/roundcubemail/managesieve.inc.php:
$config['managesieve_conn_options']=array(
'ssl'=>array(
'verify_peer_name'=>false,
'verify_peer'=>false,
'allow_self_signed'=>true));
