How can i contact with the category editor?

I just submit my site <URL Removed> to the dmoz, i want to send an email to the category editor, i tried many times, all can't send out successful, the page i get show as follows:

Proxy Error
The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request POST /cgi-bin/send2.cgi.

Reason: Error reading from remote server

Is there problem of send email through dmoz?

Wait for reply, thanks

This is a known problem and a simple search in the forum would have shown you many results.