title: A personalized email algorithm
body: <p>I've been delving into a lot of recommendation algorithms lately (collaborative filtering mostly) and I've found quite a lot of answers on recommending an item based on either a specific user or item (which is part of what I want to do, so that works out). I also want to sent out somewhat-personalized emails, meaning given an email with a certain set of products, pick a set of users to send out the email to.</p>
  
  <p>What would be the best way/algorithm to go about doing this?</p>