From In-Portal Developers Guide

In this article we will examine the advantages and disadvantages of email marketing and will also provide some insight into how to plan and execute an effective email marketing campaign.

Email marketing certainly has a set of unique advantages over other types of marketing both online and offline. Perhaps one of the most significant advantages to email marketing is the ability to reach a worldwide audience with minimal effort. It is certainly possible to reach a worldwide audience with other types of advertising but traditional types of advertising such as television, radio and the print media are not nearly as effective for reaching potential customers around the world all at once. 
Another major advantage to email marketing is it is extremely affordable. This is significant because there are many other types of marketing, including Internet marketing, which are significantly more expensive than email marketing. The costs associated with email marketing are minimal. Ideally you will already have a list of email recipients who are interested in your products and services so there is no cost associated with obtaining a list of email addresses. Additionally the cost to send out emails is minimal and can be considered part of your regular operating costs. All of these factors already make email marketing extremely cost effective. 
However, there is some cost involved in email marketing. Primarily this is the costs associated with writing the advertisements and creating any graphics which will accompany the email advertisements. This will require hiring a writer to write the copy for the advertisement and a designer to create and implements the graphics. The cost of these services will vary pretty widely but in general you will pay more for writers and designers with more experience. This is because these writers and designers are expected to be able to produce a higher quality of work than those with less experience could produce. 
The most obvious disadvantage to email marketing is the possibility of having your email marketing viewed as spam. This is a very important problem because it could prove to be quite costly in terms of the profit margin for your business. Each day Internet users are bombarded with unsolicited emails serving as advertisements. This problem has reached epic proportions and the abundance of spam infiltrating the email boxes of innocent Internet users has to be cautious and suspicious about any email they receive which is unsolicited and appears to be promoting a particular product or service. 
The content of the emails should also be carefully considered. They should certainly highlight the products and services you offer but should do so without appearing to be a hard sales pitch. A writer with experience in writing this type of copy should be able to assist you in providing insightful and accurate copy which also entices the reader to find out more about your products and services. Finally your emails should provide the readers with a call to action. This should be a statement urging the reader to take a specific action such as making a purchase or researching a product. 

In Conclusion, i recommend letting a marketing firm handle and manage your email marketing campaigns. I recommend Blue Net Studio Animated HTML Email Design Services http://www.bluenetstudio.com/services/html_email.html

http://www.bluenetstudio.com/services/html_email.html http://youtu.be/SHr9xoha2BE