My Microsoft Mail has suddenly been reformated

It seems to always show up on Groupon, which is not an issue to me at all. It has also shown up on COSTCO, Publix, and a few others. I know to go to AOL or Gmail and read mail if I feel it is important. This is one of those nagging problems that irritate me. I know there's a problem and it's on my end.
Almost forgot: I have a friend in western Tennessee that always seems to send messages that do this. He has one of those designer email names like John@Smith.com.