The following instructions will allow you to deal with annoying senders. Note: Following these instructions, does not prevent the message from being downloaded, it merely moves it immediately to the Deleted items folder. From this point on, you no longer need to deal with that particular sender.
1. Select the message exactly the way you would if you were going to open it.
2. Use Alt-M, as in mailto open the Mail menu.You will be asked to confirm this action, press Enter on yes. You will than be asked if you want to delete this particular message. Press Enter on Yes. From now on all messages from this sender will go directly to the Deleted items folder, without you even seeing them.
Updated on ... February 24, 2015