vps/roles/nginx/templates/sites-enabled/mail.conf

server {
    listen 443 ssl;
    listen [::]:443 ssl;

    server_name mail.{{ domain }};

    location / {
        proxy_pass https://127.0.0.1:{{ ports['mailserver_https'] }};

        include /etc/nginx/snippets/websocket.conf;
        include /etc/nginx/snippets/proxy.conf;
    }
}

server {
    listen 443 ssl;
    listen [::]:443 ssl;

    server_name mta-sts.{{ domain }};

    location / {
        return 404;
    }

    location = /.well-known/mta-sts.txt {
        proxy_pass https://127.0.0.1:{{ ports['mailserver_https'] }};
    }
}