Let's lose this existing comment.  I think the most useful thing we could say here is: "We are an activity that returns a value so that we can return to the triggering app after the user has finished composing the message. What we returns does not matter."

I think we definitely do want a comment that explains the impact on our UX about notifying the user given that we're going to bail from the email app.  As I understand the code right now (not 100% yet), it seems like this would want to trigger a toaster but the user won't see it since they'll be back in their originating app.  If so, we should indicate if it's intentional that we don't give the user feedback or not.