Nginx mail proxy

[imwack]

I want to use nginx as a mail proxy.I am new to nginx and need some help
with the configuration, I got some problems.
I want to use Foxmail ,use ngx proxy , this is my configuration.
mail{
        #server_name    mailProxy;
        auth_http       localhost:80/php/auth.php;      

        pop3_capabilities       LAST TOP USER PIPELINING UIDL;
        pop3_auth               plain   apop    cram-md5;
        imap_capabilities       IMAP4rev1 UIDPLUS;
        smtp_capabilities       "SIZE 10485760" ENHANCEDSTATUSCODES 8BITMIME 
DSN;
        smtp_auth               login plain cram-md5;   

        server{
                listen 25;
                protocol        smtp;
        }
        server{
                listen  110;
                protocol        pop3;
                proxy   on;
                proxy_pass_error_message on;
        }

        server{
                listen 143;
                protocol        imap;
                proxy on;
        }
}
and my auth script using PHP as follow:
<?php
/*
        Nginx sends headers as
        Auth-User: user
        Auth-Pass: password
        In php see as HTTP_AUTH_USER HTTP_AUTH_PASS
*/


        if(!isset($_SERVER["HTTP_AUTH_USER"]) ||
!isset($_SERVER["HTTP_AUTH_PASS"])){
                fail();
        }
        $uname = $_SERVER["HTTP_AUTH_USER"];
        $upass = $_SERVER["HTTP_AUTH_PASS"];
        $protocol = $_SERVER["HTTP_AUTH_PROTOCOL"];

        $backend_prot = 110;
        if($protocol=="imap"){
                $backend_prot = 143;
        }
        if($protocol=="smtp"){
                $backend_prot = 25;
        }


        $backend_ip = "*.*.*.*"; //backend ip

        //auth
        if(!authuser($uname,$upass)){
                fail();
                exit;
        }

        $server_ip = $backend_ip;

        pass($server_ip,$backend_prot);

        function authuser($user,$pass){
                //auth
                return true;
        }
        function fail(){
                header("Auth-Status:failed");
                exit;
        }
        function pass($server,$port){
                header("Auth-Status:OK");
                header("Auth-Server:$server");
                header("Auth-Port:$port");
                exit;
        }

?>

But this does not run,when i use telnet test,as follow
telnet 192.168.42.132 25
Trying 192.168.42.132...
Connected to 192.168.42.132.
Escape character is '^]'.
220 wack ESMTP ready
auth login
334 VXNlcm5hbWU6
base64(username==)
334 UGFzc3dvcmQ6
base64(password)
451 4.3.2 Internal server error
Connection closed by foreign host.

what's wrong ,and the error log as follow:

2015/03/21 12:35:39 [error] 55719#0: *151 upstream sent invalid response:
"550 insufficient authorization" while reading response from upstream,
client: 192.168.42.132, server: 0.0.0.0:25, login: "***@**.**.cn",
upstream:***.***.***.***:25

The '*' is my username and backend ip.  192.168.42.132 is my vitual machine
ip.

Posted at Nginx Forum: 
http://forum.nginx.org/read.php?2,257510,257510#msg-257510

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