Imho there is no bulletproof protection because sometimes it 'gets' legit email as well, sometimes ….
I change isp email address every 2-3 months, I got one anon email account (Hotmail) and over there i'm receiving 100k+ emails per day but that email address is 21 years old, using it just for my gaming needs
I think Philip or cat can give you better advice
Bookmarks