Easier LPT that doesn’t hope that email validations allow this trick. Create a similar but new gmail just for spam. OG email would be hello@gmail.com. Spam email would be Hellospam@gmail.com. Now all spam email goes to an entirely different email account you can purge at will in cycles. Use it for site registrations when you only want to access it once. Use it for newsletters. Use it for giveaways. It is as easy as a single click to swap between gmail accounts on iOS, Android, and PC.