RB6 would fit the HTML email to fit the entire preview window. RB7 does not. There is a lot of white space on the edges. I have included a screen cap showing what i mean. It is especially noticeable as the preview window size cannot be changed.
I am not sure which one is “right” but i sort of prefer the way RB6 displays the message. I did notice that not all HTML emails do this. Some look the same on both RB6 and RB7, but some are like what i am describing.
On another note… when i click the HTML button, it is rather annoying that i get a confirmation if i want to do it or not. the old RB6 never asked. I understand that the confirmation is there for those who would blindly click on it and end up getting a malicious script doing nasty things, but at the same time it would be nice to be able to disable the warnings. and perhaps a way to reset those reset warnings in the setting somewhere.