Image Rollovers for Mobile and Non-Mobile Email http://freshinbox.com/blog/image-rollovers-for-mobile-and-non-mobile-email/
Keep High-Density Displays from Uglifying Your Emails http://blog.mailchimp.com/keep-high-density-displays-from-uglifying-your-emails/
Get Your Email Opened: First Impressions Make an Impact https://litmus.com/blog/first-impressions-make-an-impact
Animation in email – does it serve a purpose? http://www.pure360.com/blog/blog-entries/Animation-in-email-does-it-serve-a-purpose
The Finer Points of Styled Alt Tags http://blog.goolara.com/2013/01/24/the-finer-points-of-styled-alt-tags/
9 Email Marketing Pet Peeves That Will Cost You Money http://emailcritic.com/2012/12/email-marketing-pet-peeves/
Designing an Email that Sells http://www.theemailguide.com/email-marketing/designing-an-email-that-sells-by-kristin-huddleston-vision6/
Six Great Responsive Email Designs http://blog.lyris.com/email-inspiration-six-great-responsive-email-designs/