fix(emails): make emails responsive + work with outlook

Addresses #706 and #761 

Before: https://www.dropbox.com/sh/f8bqyg1jxq5ojie/3WnR4Bse0U 

### After: 
Verify: https://www.dropbox.com/sh/qoln4mz6cma73o8/qs297XDxPc
Reset: https://www.dropbox.com/sh/bmhw0bvvbv04z9f/2YB1uU65Eo