I've been getting up to speed on how to author a responsive email. This seems like a vertical job to me that would be ideal to hire out. We have protoypes in invision that we need translated into a responsive html email that renders well in different clients. Ideally, I could use the template to send emails on demand via python.

Where can I find an good email authoring service where I can have full control over the resulting html content? Would also need screenshots of the email as rendered in the various clients.