Happens all the time to me. Some of my fellow [first-initial][last-names] are "smart" people -- a professor and a judge, among others -- and I know that they are putting in their own email wrong.

I know this because I'm frequently getting mail from automated systems for something they filled out.

I mean, I know there's an xkcd about this, but seriously? How do you mistype your own email address so often? In both cases, their real addresses are [first-name][last-name].