error running /usr/local/nginx/sbin/nginx

[Winnie]

Hi all,
I can't run "nginx" as following error:

2007/08/17 15:46:05 [emerg] 26265#0: unknown directive "mail" in 
/usr/local/nginx/conf/nginx.conf:6

pls help....thx a lot...

configuration as following:
=================================
worker_processes  1;

events {
    worker_connections  1024;
}

mail {
    auth_http  localhost:80/cgi-bin/auth.php;

    pop3_capabilities  "TOP"  "USER";

    server {
        listen     110;
        protocol   pop3;
        proxy      on;
    }
}