Co-founder of Mailgun here. One of the triggers behind this kind of analytics came from the excellent blog post by Paul Stamatiou (<a href="http://paulstamatiou.com/startup-user-retention-lifecycle-email" rel="nofollow">http://paulstamatiou.com/startup-user-retention-lifecycle-em...</a>) which highlighted the importance of detailed analytics for <i>all</i> types of emails you do, not just "weekly newsletters".<p>Additionally, we discovered that most of our users <i>also</i> use traditional email marketing companies, so we decided to kill two birds with one stone.<p>This new product we've launched basically allows you, the developer, to become your own Mailchimp over the weekend at a fraction of the cost. And slice/dice your email traffic with arbitrary granularity, down to individual message level.