The following template looks fine when viewed in a web browser. It also looks great when viewed in Mac Mail. But when I view it using Mail on an iPhone, the top gray bar doesn't go all the way to the right like it does on the left. If I change the top header text from "Testimonial Match Alert", to something short like "Test", then the gray header bar will extend all the way to the right of the iPhone screen.

I've been working on this all day and can't figure out why it's only doing this on the iPhone. Does anyone have any helpful advice?