With 50% of emails in 2013 being opened on mobile or tablet, responsive design has become a must rather than a choice. You do not need to have your own in-house marketing team to create an impactful responsive email campaign. There are many prepaid templates available on the web ranging from £5 to £30. Example of responsive design. If you like a freebie (like me) then check out our five favourite responsive email templates below. 1. Zurb 2. Antwort 3. Campaign Monitor 4. Stamplia via Litmus 5. Email on Acid Want to get some serious ROI on your email campaigns? Why not see our approach to email marketing.