Vital functionality Rated 5 out of 5 stars

I've had this addon so long I'd forgotten it wasn't built-in. Sorry but I've been around the internet too long I guess. If you can't see the sender's e-mail address until after you open the mail, you can't protect yourself from spam. I don't see how it's possible something so basic has escaped TB's developers for so many years. Without this addon working I'll be downgrading back to TB 2.x .