Don't really have any other ideas I'm afraid. The only other thing I could suggest is does your e-mail have something like "This is spam" for you to select? Or even block the sender?
Don't know if either of these will work tho...
Amazon Prime Day 2018: Best Deals & Launches
Say aloha to the summertime vibes of artist Kim Sielbeck
The best Amazon Prime Day Apple deals 2018
Les meilleures séries Amazon Prime Video (2018)