Markdown e-mail is an excellent feature. For us scientists out there, supporting MathJax in e-mail would be an amazing addition. A connection to the public MathJax secure server would be sufficient.
Thanks for giving this some consideration!
Count me in.
Riccardo Benini commented
This would be a killer feature to me. Definitely.
Claudio Satriano commented
This would be the feature making me with switch completely to Airmail!