Email - Not a lot has changed in the past 20 years, I think we can do better. Yes, Gmail was pretty innovative but I still think there are plenty of things to improve.
Fully agreed, I think wave was an awesome concept, but a terrible implementation. Managing email programatically in particular for me is a nightmare, sendgrid is an awesome service, but processing incoming email should be much easier. (I have yet to try lampson)
Is there an available solution for the reverse of SendGrid? Basically a service which would receive your emails and then post to a url on your application.