Since I first started using the App Store I have bought all my apps under my AppleID firstname.lastname@example.org or email@example.com. I recently had a problem with firstname.lastname@example.org showing as the verified email address against AppleID email@example.com, and Apple sorted this for me. However, since then, EVERY app update from the App Store prompts me to enter the password for "firstname.lastname@example.org". This is indeed an old email address of mine but I have NEVER used it to buy an app from the App Store, and I know for a FACT that these apps were bought under email@example.com or firstname.lastname@example.org. What on Earth is going on? If I try to use my usual passwords on the email@example.com app updates, they are incorrect, and if I go Apple's ID support page and try to reset the password, the site says it's sent an email to firstname.lastname@example.org, but no email ever arrives to that accoount.