Checked a fresh install of LEAP 15.5, actually about 3 days old, dovecot and roundcube. /etc/roundcubemail/config.inc.php appears correct "out of the box". The /etc/roundcubemail/config.inc.php in my installation contains different and less verbose comments than the "fresh" one. Further /etc/roundcubemail/config.inc.php.sample, on my machine, very closely, perhaps exactly, compares to the fresh install and differs from /etc/roundcubemail/config.inc.php on my machine as in the former citation. So, I must conclude in agreement with you, that this is a case of either ID1oT syndrome, or, PEBKAC syndrome. I understand it to be quite common, virtually identical in meaning and occur with greater frequency as the meat sacks and neural net content age out. Must have copied and pasted some example from earlier versions of roundcube found in the wilderness. I really should have checked against the sample before raising this (so-called) bug. Sorry for the inconvenience. And the poor attempts at humor. joe a.