Make the banner indicating you are not responding to the latest email more visible.
I would like to see the banner when replying to an email that is not the latest in the email thread to be more visible. In addition to this, a prompt forcing to click an acceptance box when trying to send the email could be helpful.
Calway McCormick commented
I wish the "You Are Not Responding To The Latest Message" warning was a bit bigger or brightly colored and noticable.
It blends into the message a bit too well and I fail to see if a lot.