Hide Edit View link in Newsletter
Remove permission for anonymous users to edit views from yoursitesname.com/admin/people/permissions

It kind of a long page, so try "ctrl+f" and there type "administer Views" and uncheck the right permission.

If it's not helping, try using another Newsletter module (It's maybe a bug since there is no logical reason to give to email subscribers edit your views, of course).

Please update in comment what worked for you.