Does MDM support CSS media queries in the emailing model editor? FYI these media queries help emailling to be "responsive".
Are you using the new drag'n'drop editor? Its layout is designed to be responsive by default.
More information on some of the "special" characters can be found here:http://www.microsoft.com/en-us/dynamics/marketing-customer-center/design-message-content-using-the-graphical-editor.aspx
Thank you for your answer, and it works fine, but I don't think there is a button to delete the columns in this editor and this complicates the use.