ibr I can not find ./configure file in gninx folder. It is also not clear what is the name of the file in the example or where it should be save!!!
You don’t need to configure an NGINX mail proxy to get Mailcow working. Mailcow works fine as it is. Just forward all the necessary ports to it and you should be fine.
I only posted that link to support my point, which was that even if you were to use an NGINX proxy, you would still have to forward port 25. Port 25 must be forwarded as a bare minimum, if you want to be able to receive mail from other mail servers. There is no way around it. NGINX does not magically allow you to only use ports 80 and 443. Y