Have you noticed product promotions from Amazon are based on where you were looking for previous day? This approach of Amazon to email is strongly centred on data and understanding the customer. I personally don’t see the point of seeing an email based on product I was looking for last week. But again it could be a nice reminder for others to make a purchase.
Screenshot above shows my browsing history which I can delete if I want to. This is the key for Amazon to find out what I like. If you don’t like Amazon to remember your behaviour there is an option to turn off. Saying this I have seen complaints – “I’ve turned off browsing history……. I’m still bombarded by emails from Amazon…” (Follow complete discussion).
If you are selling products across the range, you can learn the Amazon way with some sort of tools (CRM) in place which can learn browsing behaviour of your visitors and trigger email based on what they are interested in for better conversion.