owa.conf

upstream http_mail3_mrs_backend {
    server 192.168.4.123:88;

    ntlm 999;
}

upstream http_mail3_exchange_backend {
    server 192.168.4.123:443;
    keepalive 16;
    ntlm 999;
}

server {
    server_name owa.xxxxxxx.com;

    proxy_http_version 1.1;
    proxy_set_header Connection "";
    proxy_set_header Host $host;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Real-IP $remote_addr;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

    location = / {
        proxy_pass http://http_mail3_mrs_backend;
        allow all;
    }

    location = /favicon.ico {
        proxy_pass http://http_mail3_mrs_backend;
        allow all;
    }

    location /nginx_status {
        stub_status on;
        access_log off;
        allow 127.0.0.1;
        allow 192.168.4.0/24;
        deny all;
    }

    location / {
        proxy_read_timeout 600;
        proxy_send_timeout 240;
        proxy_pass https://http_mail3_exchange_backend;
    }

    listen [::]:443 ssl ipv6only=on; # managed by Certbot
    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/owa.xxxxxxx.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/owa.xxxxxxx.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

}


server {
    if ($host = owa.xxxxxxx.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    listen 80;
    listen [::]:80;
    server_name owa.xxxxxxx.com;
    return 404; # managed by Certbot


}