- a while back I tried to apply this principle in my gmail - filter everything not from a human out of my inbox using rules and filters (filtering anything with the word “unsubscribe” works well until someone forwards a thread to you that started with an email from a service).
It is a little frustrating though, I’m sure gmail and most modern email services could do a very good job on a filter like this if they tried.
I use a separate address that I only give to people. Never use it for forms or sign-ins, and if anything marketing-related makes it there it's instantly spamboxed.
He then gives one of those separate emails to humans.
Companies he orders from gets another email address.
Social media companies get another one. Etc.