I'd like add some functionally to my website where I can offer customers who have purchased products from me say 2 weeks previous a 10% discount on their next purchase in return for a review of the product they initially purchased.

Ideally I just like to send them an e-mail. Saying thanks for the purchase and if you add a review of the product we'll give you a 10% discount on your next purchase. The problem I'm having is that

A) I want the generated e-mail to contain a simple link for them to click on that will take them to the product they purchased
B) I only want to send it to customers who purchased say 14 days previous

I know I can do the above manually but I would prefer to automate the process therefore if anyone has any ideas on the above or can think of another way I can do this I'd appreciate your thoughts.

Thanks
Tony