As I compose a new message the “Send mail” button is between the “Move draft to trash” button and the “Close draft” button. All icons are the same size, color and close together.
Thinking in terms of a day-to-day use, the “Send mail” icon/button should have a distinct size and appearance. When it is time to press “Send” it is important to complete that action clearly and confidently – especially when speed is a factor.