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Hello (name)

Thank you for ordering [product name].

As a valued customer of [Company Name] we ask you to take just ONE minute and respond to this email...

Have you received your [product name] yet?

Are you happy with your purchase?

What is the ONE thing [Company Name] can do to improve our product or service to you?

Are you aware of the "News List" that emails you special deals every three weeks?

If not - AND YOU WISH TO JOIN THE LIST - please go to [URL Address].

Thank you.
[Your Name]
[company name]
[Address]
[url]

The [Your Name] can be phoney - like Betty Crocker - if you like, but I would sign it with the customer service manager's name, if it were up to me. After all, it's his responsibility to keep the customers happy.