Tasks due notifications will be sent to all users added to a transaction in users and contacts. Each user must make sure to have the tasks due notification turned on in his account. This can be done under Notifications tab.
Daily tasks due email notification will show only tasks assigned to you personally. This will remind you of documents still needed and also send a daily notification of checklist tasks that need to be completed that day by you.
Note: Be sure to add them as a user. They will receive full access to the transaction and receive notifications on all tasks that need to be completed.