Are you able, is anyone able to report it as spam?
Would that help? I clear my spam out first thing after going to my e-mail every time. It sure has cut down on the numbers, because the return cookies code reports that they are unread.
I recently enrolled with a free microsoft security program.
They offer help with problems like this...You can actually talk to a live person if you want to, or chat with a technician. They will probably already know about this nusance pop up.
They keep after a problem until it is solved. If they say they will get back to you they will.