The answer to this question can be very simple and also it can be very complicated for a person who is just starting their online business. Many of us have difficulties in building a list and developing a fruitful relationship with the subscribers. If these two are not performed then, there is a gap in the system and email marketing will not be effective.
Before we go in depth, we may want to look at the fundamentals of email marketing.
In order to make email marketing effective, first of all we need to have subscribers and when I mean by subscribers, it has to be reasonably a big list. Because a conversion rate, although it may vary, could be 1 buyer out of a 100 or a 1000 subscribers. The conversion rate also depends on the value perceived by your subscribers about yourself and your product. By that, I mean to say, how convincing have you been to your subscribers. How much do they trust you to get them influenced to buy your product.