You guys should try out Knak.
Knak makes creating Marketo responsive email and landing page templates, simple. Then you don't have to worry about these types of things anymore since we have done all of the difficult coding for you. In fact you don't have to do any coding again.
Knak is a SaaS responsive Marketo template builder, built for Marketers. A Marketer can create their own responsive email (or landing page template) customized for their brand with their colors, logo and social links, with no coding required.
I'd encourage you guys to try it now, free:
www.knak.io