I have a bizarre situation with Mac Mail. I have a message that I cannot get out of my in-box. It's grayed out. It won't display. But, the header keeps showing up in my "Inbox". I've tried moving it to the trash using the menu. I've tried using the delete button. But, no matter what I do, it will just not go away. I've never seen anything like this and have no clue what happened with this email to make it so persistent. Any ideas?