Bullet points. If you don't have a rapport spell things out paragraph style and then finish the email off with something like this...
So considering the above I'd like to get your opinion on these points:
Do you think the widget should be blue or orange?
Given the expected market impact do we want to bring in PR for our e-widget announcement?
Alternatively, instead of saying "Thank you" end every interaction with "Fuck you" to cost them just as much.