Send list : Move message into a sequence
While moving, the insertion position is marked with a small red arrow at the left edge of the window.
To move a message from the list into a sequence, press the Shift key and drag the message to the subject line of the sequence (marked in yellow).
The key does not have to be pressed to move a message out of a sequence.
Further key codes for rapid editing are displayed when you right-click on a message.