[nsfmc]

although this was announced on friday, it has yet to be enabled (at least on test emails i've been developing). I'm not sure why it was announced without the feature being generally available, but i guess whenever they flip the switch, old emails will be upgraded to use the style tags embedded in them?

Even without media queries, enabling <style> blocks in html emails is huge (google was the last holdout). For anyone developing html emails, this is a nice set of changes.