At the request of Thaddaeus Frogley, whose real email address is... no, just kidding... I've looked into the whole email address thing.
Basically, if you give a URL and an email address, your email address is not present in the HTML. If you just give an email address, it is in the HTML, but its scrambled, which means humans can read it, but bots have trouble.
I've allowed anonymous comments on this blog now. If it causes trouble, eg comment spam, I will have to deactivate it again.