You can cancel a mail that is outstanding i.e. which has some pending actions, by Cancelling it.
1. Select the mail that you wish to cancel. Click on the "Cancel" button.
2. This opens a dialog asking for confirmation to cancel the mail. Click "OK". Please note that only the sender of the mail can cancel the mail.
3. Even if the recipients who previously had actions pending with them for the mail open it, they will no longer see the action and see that the status is "Cancelled."
