reply to RAZ Black
Re: Teach us how to stop these people. Would it be better to mask that IP address as coded string of some kind?
In this demo you're just putting their IP address in the e-mail address. All they'd have to do would be to check against the address containing an IP address.
That way they spam trawling bot code would not have as easy a time checking against it.
It's supposed to be on a page that's not going to be humanly read. So you're not going to get hits unless something is programmtically loading the page.
So you could have some sort of random word generator tracking their IP address and issuing a custom address based on it.
You might consider your robots.txt file requesting they NOT traverse the page. This way they'd engaging in a second form of abuse, trawling the page when being explicity asked no to do so.