How to get phishing or spoofing reports forwarded to the appropriate authority?

I sometimes get spoofed emails purporting to be from Amazon which try to scare me into clicking on a bogus link by claiming my account has been frozen or my payment on file has expired or some such BS. I am unable to forward these emails, either as an attachment or in the original format) to "stop-spoofing at amazon.com" although I am able to forward them to "spamreport@cox.net" (as an attachment).

How can I get Cox to forward these emails to "stop-spoofing at amazon.com" since they (Amazon) are the only ones who have the motivation to protect their customers.