Hey Ron,
We have done this in the past, except we set up the Interesting Moment for when they are delivered the email. We didn't care too much if they were sent one, but never saw it.
We have moved away from this because there is not much value unless you start creating interesting moments for when they open and/or cllick. And if you take that route, your Interesting Moments can get quite long and muttled. Also, if they want to see the Content that was sent, they would still need to go to the Email tab.
Have you considered creating a completed task for when emails are sent/delivered? I know some organizations are very particular about what they put in the tasks, though.