Preview email toggle

I appreciate that images don’t show automatically, but I’d like even more protection from scammers. I want both:

  1. Have a full height preview as I move through my mail
  2. Also have the ability to mark 5 or 10 emails (scams and spams) for deletion without opening them up.

A shortcut key or button, either one, would be great. I’d like to use it to delete bad stuff without opening it.