Got some email forwarded from my long-ignored ISP email account that was obviously intended for someone else, so I investigated. Turns out the unused email account I had with my ISP was run through Yahoo, so had to jump through hoops to figure out how to get in so I could change my password. Couldn't be any longer than 24 characters and only a very limited (hyphen and underscore) subset of special characters. Good thing I don't actually use it for anything.