<http://schema.org/image>
<http://rack.1.mshcdn.com/media/ZgkyMDEzLzA3LzEzLzRkL2VtYWlsbWFya2V0LjQ3N2FhLmpwZwpwCXRodW1iCTEyMDB4NjI3IwplCWpwZw/9ecc00f3/453/email-marketing.jpg>
<http://mashable.com/2013/07/13/write-awesome-emails/>