Exchange 2003. I continue to receive the same emails from a few senders. I do not think the emails are spam. I receive the duplicates in both Outlook and OWA. They do not come all together... rather, I receive the duplicates about 30 minutes apart. It is as if our Exchange server is not sending a message back to the sender's mail server saying "I got it, so you don't have to send it anymore." Important: This happens to other users too.