Sometimes you want to create messages and send them on a later date. A good example are a New Year greetings. This is how you can do it.
Clicking the "Send & Close" toolbar button will bring up the "Delivery Options" window. Turn on "Send later" and choose the date and time under "Delivery Schedule". Example:
After you click "Send", the message is scheduled for delivery. You can edit it or delete via the "Outgoing Mail" tab of the "Status" panel (main window):
To edit a message, double-click it. To delete, right-click and choose "Delete".