Sarah offers this little nugget — a recent study of email users shows that one in 5 admits to having used the “this is Spam” button on their email client as a way to unsubscribe.

This sucks, because spam complaints are among the “behavior based” factors ISPs use to decide whether to block your emails. So if your unsubscribe process is kludgy (examples being having to answer survey questions or sign in), this is a great time to clean it up.