How can I deleted unwanted contacts in Messages App

I do not use google for my email account (I use outlook). When I go to contacts my contact list is fine. However when I go to the Messages app I have a lot of contacts that should not be there. I don't know where they are coming from. I am not synching with any other list other than my outlook email list. I could go in and delete them individually but I don't know why they are there because they are not contacts I have used in a long time. If I go to "settings" in messages there is not an option to chose which list I want to use.

 

The contacts do not show up in my contacts app, the only show up when i display contacts in the messages app.