<http://schema.org/image>
<http://static1.squarespace.com/static/517f71d3e4b0d875cbc78753/t/560cb19be4b081f0a96f4b79/1475636377044/>
<http://www.digitalpigeon.com/blog/2015/12/11/weve-made-some-improvements-to-email-delivery>