I just want to make clear that I had created this mail account over a year ago, but never fully set it up because I decided to add a different email. I know how to add/remove accounts, but the only 2 showing up are the ones I am currently using. My other macbook running snow leopard would do this with current email accounts that it was using, but I haven't encountered this with an unused, removed, email account. Unfortunately, it literally pops up every 10 minutes asking me for the password, and it is a real nuisance especially when using full screen apps / concentrating on work.