fixed sieve host

roundcube/roundcubemail-1.2.2/plugins/managesieve/config.inc.php

 // %n - http hostname ($_SERVER['SERVER_NAME'])
 // %d - domain (http hostname without the first part)
 // For example %n = mail.domain.tld, %d = domain.tld
-$config['managesieve_host'] = '%h';
+$config['managesieve_host'] = 'SIEVE_HOST';
 
 // authentication method. Can be CRAM-MD5, DIGEST-MD5, PLAIN, LOGIN, EXTERNAL
 // or none. Optional, defaults to best method supported by server.

roundcube/vars-files

 /var/www/html/config/config.inc.php
 /var/www/html/plugins/password/config.inc.php
 /var/www/html/plugins/vacation_sieve/config.inc.php
+/var/www/html/plugins/managesieve/config.inc.php