By default the policyd is using IPv6. This needs to be forced to use IPv4 since the VPS I’m using doesn’t seem to have IPv6 enabled nano /etc/supervisor/conf.d/policyd.conf Replace command=/srv/modoboa/env/bin/python /srv/modoboa/instance/manage.py policy_daemon with command=/srv/modoboa/env/bin/python /srv/modoboa/instance/manage.py policy_daemon --host 127.0.0.1

git clone https://github.com/modoboa/modoboa-installer cd modoboa-installer ./run.py --stop-after-configfile-check domain.com nano installer.cfg Add the folloing to installer.cfg [database] engine = mysql host = 127.0.0.1 install = true