Using the context.io API for a while now. I like how it can help address a fear of "lock in" and not owning your email-data like you might have with something like <a href="https://postmarkapp.com/" rel="nofollow">https://postmarkapp.com/</a><p>Also hosting your own email boxes has come out of fashion in recent years but with a good "middle-ware" maybe it gets interesting again.<p>Good idea with the hackathon folks!<p>C