I open-sourced a selection of simple transactional email designs. Responsive. CSS inlined. Tested in all major email clients.
Here's the GitHub repo or you can read more about it on our blog.
Updates to Mailgun.
If you're not familiar with Mailgun, it is a service (API) for sending email. Try editing the code on the homepage then run it in your terminal to send yourself an email.
mailgun.com
