Your autoresponder service should give you the ability to track open rates and click through rates. Along with looking at the conversion rate of each of the sales promotions you offer, that is about all the information you need to determine your email effectiveness.
Over time, you will notice a pattern – your list will buy certain types of products and not others. Over time, the open rate of your list will go down. The reason for that is that people who have been on your list longer will not open as many emails. As your email list gets older, and the average length of time that the average subscriber has been on your list increases, your email open rate will go down. The same can happen with the click through rate, although I think that with the proper communication and relationship building with your list, that your click through rate of opened emails can stay higher (at least not dropping at the same rate as the open rate will drop).
How to Test Title Effectiveness
The key here is the open rate. Assuming that your relationship with your subscribers is constant, and assuming that you mail at the same time of the day, and on the same day of the week (open rates tend to fluctuate according to time and the day of the week), then the effectiveness of your title or subject line will be evidenced in your open rate.
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Sean Mize is a full time internet marketer who has written over 400 articles in print and 8 published ebooks.