Why the iOS Mail app shows a phantom unread message badge and what to do about it

If you don’t regularly check your email throughout the day, the unread badge count on your iPhone or iPad is an indispensable part of your workflow. When it works, that is. If your iOS Mail app is like mine, it often shows a lone unread email badge even when everything’s been read, which can get annoying.There’s a simple explanation for it that doesn’t involve nuking your account and starting over (believe me, I’ve tried). It has to do with rules. While you can&rsq