Dirty flag

When this option is on, a dirty flag will appear on the left-hand edge of the status line to let you know when you haven't sent a message yet. Whenever you alter the text of the message, the dirty flag will appear; whenever you send or clear the message, the dirty flag will disappear. This is useful to keep track of whether or not you've sent a message.

Here's the normal status line.

Here's the status line when the message is dirty.

Back to the Sender Options dialog page.