Every auto task that is created within Broker Brain has to have a group assigned to it. A user may also be assigned, but this is not required. Each time an auto task is generated, Broker Brain sends out a system email notifying users of the task. If a specific user is assigned to the task, the email goes out to the assigned user only. If, however, there is no user assigned to the task, an email is sent to every member of the assigned group.
If group members do not wish to receive these emails, they may opt out of them IF their system administrator has allowed it. To opt out, click here and follow the instructions for Disabling Task Email Notifications, found near the bottom of the Help page.