mail.conf

server {
        listen 80;
        server_name x.xxx.xxx;
        rewrite ^(.*)$ https://${server_name}$1 permanent; 
}
server
    {
        listen 443 ssl http2;
        #listen [::]:443 ssl http2;
        server_name x.xxx.xxx;
        
        location / {
            proxy_pass http://172.20.0.6/;
            proxy_set_header Host $host;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header REMOTE-HOST $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }


        ssl_certificate /etc/nginx/cert/xxxxx.crt;
        ssl_certificate_key /etc/nginx/cert/xxxxx.key;
        ssl_session_timeout 5m;
        ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
        ssl_prefer_server_ciphers on;
        ssl_ciphers "TLS13-AES-256-GCM-SHA384:TLS13-CHACHA20-POLY1305-SHA256:TLS13-AES-128-GCM-SHA256:TLS13-AES-128-CCM-8-SHA256:TLS13-AES-128-CCM-SHA256:EECDH+CHACHA20:EECDH+CHACHA20-draft:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5";
        ssl_session_cache builtin:1000 shared:SSL:10m;
        ssl_dhparam /etc/nginx/cert/dhparam.pem;
}