peterg wrote:
1. When comparing settings, also compare System Preferences > Language & Region settings.
2. To delete these emails, find something in common with them (e.g. "from", subject, something in the body, etc.). Then do a Search using that common item. Then, check the "All" mailbox for found emails. Assuming you get some, select all of them and Delete.
If you find a common or single email address part, you can set you email filter to automatically delete these and then you will never see them.