Huh, after I signed up with Facebook they had my real email address. I haven't worked with the Facebook API for a couple years but they didn't used to give third parties access to the real email.
The permissions popup when connecting with an app explains this and gives you an opportunity to send a proxied email address. Albeit its designed for you not to see it, in small fonts.
Thanks for the bit about the proxy address. I had no idea that option existed.
It defaulted to my real address, and I had to change to the proxied address.