Allow for annotating emails
The ability to take a quick note that gets saved to an email or highlight sections of an email would be an excellent tool for keeping track of a wide variety of things. Annotations/notes would be visible only to the user.
This example came to mind when I purchased four game keys for friends and I lost track of which keys I gave to friends and who had accepted them. The ability to quickly annotate in the email I received whom received which key would've been a huge help. Similarly, highlighting key parts of a long email or tasks that need to be completed would be incredibly useful.
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Alex commented
I would love that ! I have it on Hey and on Gmail I use Simple Gmail Notes !