Nginx config example for mail proxy

gistfile1.txt

mail {
    server {
            listen  15.29.8.163:25;
            protocol smtp;
            server_name  ak47.example.com;
            auth_http smtpauth.local:80/auth.txt;
            smtp_auth none;
            timeout 30000;
            smtp_capabilities "SIZE 15728640";

            # ssl default off. Leave off if starttls is on
            #ssl                  on;
            ssl_certificate      /etc/ssl/certs/ssl-cert-snakeoil.pem;
            ssl_certificate_key  /etc/ssl/private/ssl-cert-snakeoil.key;
            ssl_session_timeout  5m;
            # See https://mozilla.github.io/server-side-tls/ssl-config-generator/ Intermediate settings
            ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
            ssl_ciphers 'ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-ECDSA-AES128-SHA:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA:ECDHE-ECDSA-AES256-SHA384:ECDHE-ECDSA-AES256-SHA:ECDHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA256:DHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES256-SHA:ECDHE-ECDSA-DES-CBC3-SHA:ECDHE-RSA-DES-CBC3-SHA:EDH-RSA-DES-CBC3-SHA:AES128-GCM-SHA256:AES256-GCM-SHA384:AES128-SHA256:AES256-SHA256:AES128-SHA:AES256-SHA:DES-CBC3-SHA:!DSS';
            ssl_prefer_server_ciphers on;
            # TLS off unless client issues STARTTLS command
            starttls on;
            proxy on;
    }
}