Hi mindvault,
One of the outstanding issues is that sending html email across platforms is yet supported by MobiOne’s cordova implementation. The functionality does work on ios platforms ONLY.
This is an unsupported solution and you mileage will vary as I believe it only works on ios platforms but you can use the phoneui.composeEmail() api directly (see the phoneui.js file in your project’s generated code) and set the isHtml argument to true.
Another approach that will send the email from your Send Email action involves manually modifying the phoneui.composeEmailFromPage() where it calls phoneui.composeEmail() to pass true instead of false for the isHTML parameter. This would enable you to enter html in the Email editor.