I get unenrolled from electronic statements from Capital One and a local credit union if I go 12 months without “opening” an e-mail from them. I do open and read their e-mails but since I don’t have image loading enabled, they don’t know that so they “helpfully” start sending me paper bills again, and stop sending me the e-mails to say that the bills are ready. It’s incredibly annoying.

Perhaps this is from a nosy colleague who has enabled read receipts. I learned this the hard way when I "didn't see" an email I had in fact opened.