Cuttlefish - nice transactional email server
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There are loads of great proprietary transactional email services out there. If you're happy spending the money then take a look at Sendgrid, Mailgun and Mandrill. These are just a few of them..
It's still early days for Cuttlefish and even now it already does a chunk of the most important things the proprietary services do. Cuttlefish offers basic bounce email handling, ensuring you maintain your good mail reputation by not resending to bounced addresses. Cuttlefish also gives you insight on how people read and respond to your emails via automatic open and click tracking.
Of course there is a lot that Cuttlefish doesn't yet do that the proprietary services do. It doesn't handle incoming email; It can't detect when a user marks one of your emails as spam; It doesn't have built in support for email templates.
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Sounds nice and similar to Postal