How much time had elapsed between when you received the email and when you tried to report the email? I'm thinking...during this time...another subscriber already reported it and Cox created the rule. Just a thought. It appears Cox is already blocking it so what's the big whoop?
I get phishing emails all the time, but reporting it to cox does little to prevent them from recurring again. It's much the same as when you mark an email as spam, because chances are good you'll receive it again and again. Compared to gmail, cox webmail isn't as effective in preventing junk from reaching your inbox and I find that puzzling. Judging by all the complains about spam, I suspect that cox email filtering service is technologically behind the eight-ball and is seriously in need of an update.