Periodically, Netflix sends me an email asking me when I received a movie that they mailed, or when I mailed a movie back to them that they received. I assume that this is so that they can confirm that the mail is getting delivered in a timely fashion, and I’m sure that some people regard them as a nuisance, but these emails actually make me feel better about the service. They give the impression that somebody at Netflix actually cares. (Needless to say, I always click through to let them know that the service is working.)