Because they can so easily be deleted from my email, I only give this a 4. The problem is, it has started to leak over to text messages, and that can make it a 5 really fast.
If you have my cell phone number and my email, you should know I'm already you're friend, that's why you have them. I shouldn't have to send back some stupid message that you just sent me to prove it. In fact, if you are my friend, stop sending me emails that you say will bring me bad luck if I don't send it to 8 other people.