https://github.com/SparkPost/heml
origin - http://www.pipiscrew.com/?p=10728 heml-an-open-source-markup-language-for-building-responsive-email
https://github.com/SparkPost/heml
origin - http://www.pipiscrew.com/?p=10728 heml-an-open-source-markup-language-for-building-responsive-email