Using Odoo v8.0 community on our internal network.

I am able to setup separate emails for each task that is in open status using Scheduled actions + Server action + Email Template.

But my organization needs to have One email that send in ALL the open tasks

e.g.

Daily Open Tasks Assigned to - User XYZ
You have following tasks scheduled for today:
Task 1: Do this Task
Task 2: Do this task as well.

I tried creating a custom field for each res.user that has all the open tasks (using one2many relationship with Task module). But then i couldnt figure out how would it "Automatically" send email to ALL users in res.user.