I think that this is a really great +Gmail
feature, but for those of us who use our personal +Google+ .
profile more than a "company" page, how are we supposed to get our logo/identification image into the "Sender image" box? In my tests, I have only been able to see the letter "N" in it.
My newsletter is a very big part of my business, and I know for a fact that I will always have more Google+ followers on my personal page than I could ever have on a company page. I obviously use Google+, and if the purpose of linking a Google+ profile is to get companies on-board, then I'm already one step ahead.
It seems like there could be a way to fix this for heavy personal-profile users (like me) who are also their own brand.