If you use Apple’s Mail.app at work you’ve probably run across this problem: Someone’s default address changes to their home address without you noticing and you end up sending work correspondence to their personal email. After it happened to me today, I finally decided to take action and ask metafilter. Within minutes I had my answer: Select “Previous Recipients” under “Window” and search for the email you don’t want to send to anymore. Then just remove it from the list. Easy answer to an annoying problem.