Just installed and tested the new update – message body looks great now, thank you so much for that!
There is still one little detail that bothers me – if I add “social block” in the new editor, the facebook icon have an empty “alt” tag. Many e-mail clients does not display images by default, so they will not see facebook link at all. By the way, other icons have their alts.
I fixed it temporarily by editing /email/blocks/social/block.php file (line 34), but I assume that further updates will overwrite it. Could you please add this to the “official” version ?