I'm not a fan of partner and third-party emails. It's not that I don't believe they can be effective; it's just that most marketers go about it all wrong. Many marketers:
I have some good news. I recently opted in to receive emails from CafePress after purchasing a T-shirt on their site. After hitting submit, I was redirected to this landing page [click image to enlarge]:
Right out of the gate, I love it. Thinking about what most marketers do wrong, CafePress got nearly all of it "right."