Config Mail Proxy for POP3/SMTP microsoft exchange

[hcmnttan]

Thanks for your respond. 
So we must 1st setup an HTTP authentication server (PHP or something ) for
auth_http, right ?
Could you tell me a little more how to setup this HTTP authen URL ?

In my example:
     NGINX server IP            : 192.168.1.100
     POP3 / SMTP server IP : 192.168.1.101
	 
Thanks.
Tan

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,243743,243780#msg-243780