Delete Mail from client, Not delted from server auto downloads the message again.

Delete Mail from client, Not delted from server auto downloads the message again.

I  am able to send and receive massages without issue. When I delete a message in My mail Client the message is delete from it. But is automatically re-downloaded from server and shows back up like it was never delete and is like its a new message. How Do I fix this I am on a mac os.