In these times many big and small companies are using mass emails as a successful marketing strategy. Firstly, it's because the total cost involved into creating and sending email newsletters is less than using other promotional channels. Secondly, businesses give preference to bulk email because they can send out email campaigns as frequently as they want. They also have the full control over the email sending process. For example, they can segment the full list into smaller lists by some criteria and send more relevant email newsletters to each segment. This way they ensure that each recipient gets the information he is interested in and is not showered with unwanted emails.