We’ve all been there. You buy something in-store and request an emailed copy of the receipt. Later that day, you sign up for online bill pay, book a weekend outing, and finally sign up for that social network you’ve been holding out on. You browse the network, find a lot of great content, and opt into a handful of e-newsletters. You receive confirmation emails from each of the day’s activities, and you’re happy to have them for reference.