certain emails go to junk

Certain emails always go to junk. I have them on my contact list, have moved them, did everythig that I could and yet everyday they are in junk. I don't have a thumbs up icon; when I am in junk and highlight an email, the thumbs down remains. The only way I can get a thumbs up is to click on the thumbs down, but that is saying that the email is junk. it is very frustrating as these don't appear on my mini, so I have to go to the computer to find these emails. Any help appreciated.