There is something wrong with your setup. I'm not a visionary. Check your logs ...
I have checked the error log, please see enclosure.
check:
1) user for roundcubemail = roundcube (in PostgreSQL)
2) login roundcubemail = a user from synology NAS = is not
defined in the list of the database (every user has automatich a mail adress for MailStation)
3) looked to the file rcube_mdb2.php and don't know what to do
he checked before proceeding and gives an error...
mail works fine, calendar does'nt work. I think there must be a redirection to the users of the synology NAS and
not to the users of the roundcubemail, am I right? And how should I make this change?