It would be great to have a tutorial for implementing SOGo4 in an environment based on https://www.howtoforge.com/perfect-server-debian-10-nginx-bind-dovecot-ispconfig-3.1! I've seen several Posts to this, but none have worked for me, as either SOGo Settings weren't working, or NGINX settings weren't working (all posts were based on Apache2 and I only found an NGINX config on the SOGo website which wasn't edited to work with ISPConfig). Cheers!