Nginx SMTP relay access denied!

[shahzaib mushtaq]

Hi,

We've setup NGINX SMTP proxy in front of postfix. When i try to telnet to
nginx smtp on port 25 it shows the "relay access denied" message.:

https://pastebin.com/JF4TVqBw

 Here is the config of nginx:

mail {
        server_name mail.domain.com;

        auth_http localhost:80/auth.php;
        proxy_pass_error_message on;
        server {
                listen 25;
                protocol smtp;
                timeout 300s;
                proxy on;
                xclient off;
                smtp_auth none plain;
        #       auth_http_header HTTP_AUTH_USER Auth-User;
        #       auth_http_header HTTP_AUTH_PASS Auth-Pass;
                smtp_capabilities "AUTH PLAIN";

        }

Following is the content of auth.php that we're using :

https://pastebin.com/q49EC67N

What we want is that, any user tries to connect to Nginx SMTP proxy to send
email should be authenticated to backend. Is that possible?

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