When viewing an email in Apple Mail, you can create a Task in Daylite, right from within the Daylite Mail Assistant (DMA) window.
In the DMA window, click on the "+" sign beside Tasks. A task popup will open. This will display the same information you would see when creating a Task in Daylite.
You can assign a due date for this task so you can easily prioritize your time, as well as enter in any other important details.
Save the Task once you have finished entering all the necessary information. The Task in Daylite will now have the email linked to it.