I have a new idea which could be quite exciting and unique:
I would like to mark mails by sending them as unread (for example within the editor mask), till I go a response.
This would revolute mails management. Now I have some mails sent. I'm awaiting a request, but I forgot to handle this. When I now have them marked as undone it would be a great hint to manage them.
What do you think about this?