So AT&T sends me this pretty arnge email, take a look:
Great, right? I don't need to do anything.
But apparently AT&T is worried about whether I have received this email or not, because this is THE FIFTH copy of this email that I have received over the last week.
If you need me to acknowledge that I have received your email at this address, why don't you say so, and save me from having to wonder what you're up to, and yourself the trouble of sending and re-sending and re-sending. What a waste of everybody's time and resources.