The most effective method of measuring the success of email campaigns is by counting the number of times the emails were opened. Needless to say, increasing the number of readers who are opening these emails will proportionately increase the chances that more readers will respond in the way the emails were intended. However, the recipients of such emails must first be compelled to click on the links which will ultimately open them.

The subject line is the single most essential aspect of emails because this is what recipients see first. Therefore, subject lines should grab recipient's attention and spark their interests long enough to open the emails and then read them. In order to accomplish all that, subject lines should be phrased in such a way as to set up recipient's expectations. They should make the recipients believe that the contents of these emails will fulfill their needs, thus the recipients should look forward to opening them. The subject lines should also make the recipients want to open the emails for fear on mission out on things of importance.

Once the subject line accomplishes its goal and the recipients of the emails open them, they should encounter contents which are original and convincing as well as contain useful and offers of value, such as free products or services, or significant discounts of the same.

Another very crucial issue about such emails is brand recognition and the relationship the recipients have with their senders. There are four main groupings under which all recipients can be categorized: individuals needing the product or service, potential clients, occasional or infrequent clients and existing or recurring clients. Senders of email campaigns should understand how any given recipient got on their email list, which will allude to each recipient's motivation for being there. Recipients could have voluntarily gotten on the email list. They could have been enlisting through the purchase of products and services and they could have accidentally gotten on it because they simply forgot to uncheck a box.

Emails perceptibly written and signed by CEOs or directors will have a much higher response rate because readers will feel important being addressed by a VIP. The email list must sustain its high quality through continual and diligent management and maintenance. What's more, email lists for email campaigns must endlessly strive to expand and identify their recipients. For enhancement of the email's effectiveness and to increase the chances that they get opened and read, email campaigns must be targeted to appropriate audiences. Since email addresses change and recipients become inactive quite frequently, email lists should be broken down by their age and activity levels. The addresses of returned emails should be removed while extra effort should be made to rekindle the interests of inactive recipients with enticing offers and incentives of interest.

In conclusion, with good overall planning and effective tactics, companies can attain as much as 60 percent of their targeted audience to open informative emails and 40 percent of the commercial emails.