Blocking emails from "No Sender"

I've recently started receiving spam emails with No Sender specified and have been unsuccessful blocking or even redirecting the emails to trash or junk. There is no information that indicates where the email originated, no description, no reply to address. Blocking or marking emails as junk isn't an option (that I can find) in Mac mail unless there is some kind of information to specify what you want to block. Clicking on the sender name "No Sender" to block it doesn't work. I have tried creating a rule to move emails from No Sender to trash and this does not work. I have searched and found little info on the topic. What am I missing?