Give Confluence the ability to provide a daily or weekly update of just the current tasks that are not completed for the mentioned users, so it could help users to not forget the information when they not login in Confluence every day and specifically check their current tasks. So the e-mail notification would be similar to the list of uncompleted tasks under your profile (unless you don't have any uncompleted tasks).

In addition to the feature above, provide Confluence the ability to give a daily/ weekly updates of uncompleted taks assigned to a group of people. This will enbable certain user to get a notifications on how other users' progress is on a certain task