I don't have any feedback (not big on email myself), but i just came to sympathize with your design woes. It's just so difficult, imo.
or more like this: https://dribbble.com/shots/1334369-Mochila-Mail-manufactured
What do you think?
Personally, i think the mochila design looks better, but i really like dark designs (easy on the eyes), so the Premier is nice on that front.