I don't know what the actual share of junk mail is for physical or even e-mail, but let's suppose 90% of most people's e-mail in the entire world is spam, shou

I don't know what the actual share of junk mail is for physical or even e-mail, but let's suppose 90% of most people's e-mail in the entire world is spam, should all e-mail providers only deliver email, be it spam or not, once a day?