2. Try inbox zero and just archive emails aggressively directly from your phone’s notification without even opening email.
My inbox currently has 10 emails that one day I'll get to and the rest of spam and transactional email is just gone from view within the hour or day.
I wish I could have an "important" and a "transactional" email view, but that's not going to happen without a lot of work, so email search still sucks.