client-ip mail proxy

[Hari Hendaryanto]

hi,

i've setup pop3/imap4 proxy using nginx recently, everything work great, 
unless i cannot obtain client ip address, i'm using external auth_http 
server run on apache/php.

How do i forward client ip from nginx to apache auth server? something 
like 'X-Forwarded-For' in http reverse proxy.
this is what i have done so far by adding auth_http_header

mail {
.....
.....

       server {
             protocol    pop3;
             listen      110;
             starttls    on;
             auth_http_header X-Auth-Client-IP $remote_addr;
       }

}

i still seeing nginx ip address in apache log
i need some enlightenment here


TIA


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