I'm amazed how few clients have features to address actual day to day friction points:

- Detection of one time login codes (which is annoyingly getting more popular). It's annoying to manually copy paste them

- Detecting whether an email contains something that requires urgent action (eg court documents, complaint processes, lawyers)

- Options to filter out the torrent of "detected new login" emails

- Options to filter delivery spam (I often get 3-6 emails about nonsense minor delivery updates about - received, at customs, out for delivery etc)

ie doing clever and useful things with the content of emails based on common content and actions

Or maybe these just apply to me?