You can restore a previously deleted rule, providing it has been deleted within the past 7 days by following these instructions:
Click on the Rules button to open the Rules screen.
Click on the Trash button
to open the Deleted Rules screen.
Check the checkbox for the rule(s) you wish to restore. You can select all the available rules by checking the Select All checkbox.
Click on the Restore button to restore the rules. You can also click on the Close button to return to the Rules screen without restoring the rules.
Rules are restored with the same name they had when they were deleted. If a new rule has since been created with the same name, the restored rule has a number appended to its name when it is restored.