We have received reports that users who batch delete signup profiles who have signed a petition receive a control panel user notification for each signature removal that occurs. For example, if I batch delete 2000 people who have signed my petition, I receive 2000 email notifications for each petition signature that is removed (because of the signup delete).
Oh no! Batch updating can trigger auto-responses for certain actions. We will consider changing this behavior but don't have a timeline yet.