Solution: 1. cyrus was not enabled via systemctl 2. Some symbolic links were not set: ln -s /usr/sbin/cyrus /usr/sbin/ctl_cyrusdb ln -s /usr/sbin/cyrus /usr/sbin/cyr_expire ln -s /usr/sbin/cyrus /usr/sbin/tls_prune WTF caused this? Greetings Harry