Actually, "blowback" was the wrong word. I've got exposure on the brain lately, and that kind of vitriol is what you get when you expose.
No, what I would expect when you begin to start to date is a RESPONSE. It may not come when she reads the e-mail, which is just an announcement of your intention (I didn't get one then either); it may come when you go out on your actual FIRST DATE with someone else.