If you don't know anything about HEY, you should check out the features tour. It is a great overview that highlights many of their unique features. https://hey.com/features/the-screener
When I started using it, it was a bit uncomfortable. No notifications by default? I won't see all emails in my "Inbox"?, etc. But after the first couple of days, I realized the discomfort came from FOMO and bad habits. It's great now. JOMO, Joy Of Missing Out.
Something I see differently now is the destination assigned to senders (Imbox, Feed & Paper Trail). Maybe you want something in the Paper Trail but still want to know when it arrives. You can assign it to the Imbox and move it after reading. Which is easy with keyboard shortcuts.
@noeldemartin I've definitely had to get to grips with more shortcuts now I use i3...