[bmelton]

Have you looked at Mailchimp? It's not as much for transactional emails as it is for scheduled, repeated broadcast emails, so I suspect it's probably more along the lines of what you're looking for.

I know they also provide the web interface (and APIs) for allowing users to subscribe, unsubscribe and all that jazz.

[diminish]

I am using mailchimp for multiple clients, and AWS simple email sending for some transactional clients; they are all quite helpful. Anyone recommending sendgrid, why is it a better choice?