Antwort seems more trustworthy. Making HTML emails look good on all devices and apps is a real problem. If you view the source of a HTML mail you see crazy stuff. It feels a lot like the nineties with all that table tags.
The strange thing is that Outlook 2000 and 2003 did, because they used IE's rendering engine. But then with Outlook 2007, they switched to Word's engine for "security reasons" but haven't added some of even the most basic modern HTML features to it over the last five years...