I’m creating a list of emailclients that support and don’t support external stylesheets (mostly based on Litmus Previews). Are there people who want to help to complete this? I already have this list:

No embedded stylesheet support (styles inline):

  • Terra Mail
  • T-Online.de
  • Mail.ru
  • Android 5.1
  • Android 6.0
  • Gmail App IMAP (Android)
  • Windows 10 Mail

External stylesheet support:

  • Android 4.4
  • Apple Mail 9
  • Apple Mail 10
  • iPad
  • iPhone (iOS 7, 8, 9 en 10)
  • Lotus Notes 8
  • Outlook 2007, 2010, 2013 en 2016 (Windows)
  • Outlook 2011 en 2016 (Mac)
  • Thunderbird
  • Samsung Galaxy S4 Native Mail App