Oddity in MAIL.....wrong name showing up

Check your Mail preferences->Accounts, or more likely, your Address Book application. See whether your name in Address Book has a silhouette or a standard card icon. If it has a standard card icon, look for John Hoekstra in there. You can designate a "My Card" from the Card menu at the top of the screen in the menu bar, so to fix it, select your vCard in Address Book and then go to the Card menu->Make This My Card. Not sure how it happened in the first place, but this should fix it.

I had a similar problem, but in my case, when I got email it showed the wrong name from the sender. The same sender (let's call him "John Smith") showed up for several Facebook notifications from groups I am a part of. I went to "John Smith" in my address book and didn't see any weird email addresses which in the past had been the case when email showed the wrong address. After much hair pulling, I decided to highlight "John Smith's" real email address and delete it (cmd-x) to my clipboard leaving it blank on the address card. I then closed my address book. I went to mail and closed it too. I reopened mail and the bad "FROM John Smith" went away and was replaced by the correct email address from the sender. I then went back to my address book and pasted John's email address back into his card. To test, I closed email and reopened it and "voila!" no John Smith address in the wrong place.