imap {
    #auth_http  unix:/path/socket:/cgi-bin/auth;
    auth_http  localhost:9000/cgi-bin/auth;

    pop3_capabilities  "TOP"  "USER";
    imap_capabilities  "IMAP4rev1"  "UIDPLUS";
 
    server {
        listen     110;
        protocol   pop3;
        proxy      on;
    }

    server {
        listen     143;
        protocol   imap;
        proxy      on;
    }
}