http://blogs.imediaconnection.com/blog/2013/12/02/improving-your-email-conversion-rates/?imcid=na
For any company to stay above the rest, documenting metrics is crucial.
Conversion rates are a proven method of keeping track of potential sales versus
lost sales. During any email blitz, gauge how many recipients you begin with
versus how many eventually click through to your website, and then how many of
those continue on to make a purchase. This should give you an idea of what
you're doing wrong.