In light of my most common form of spam these days (not that I'm getting waves of them), I'd like to suggest another optional setting.

We already have "E-mail containing images must be friend". I'd like another one: "E-mail containing only URL must be friend".

I'm getting a slow but steady stream of spams of the anatomical enhancement variety, in which the only content of the message body is a web link pointing to a URL.

Great idea Lance, definitely going on the list.

Good to hear