I came up with a simple way to eliminate spam in my email, without any third party filtering.

I have my own domain name for email. My email box accepts anything that goes the domain. I.e. a catchall email account.

However, I give a different email address to every site and service. I.e. sitea@mydomain.com, site2@mydomain.com

This lets my email reliably get auto sorted by who its from.

But I also use a consistent form to the names I hand out, so that random email that comes to my domain gets deleted instantly and I never see it.

I almost never get spam. But sometimes some service leaks my email somehow and I start getting some. So I change my email with that service (or cancel it) and add that email to a manual list of incoming addresses to block.

It's so dead simple, I feel like all email programs should have the option of working with a whole domain this way.