Email marketing is an effective tool to remain in touch with your existing clients and also prospective customers. An email for product promotions or monthly newsletter to existing clients & or new customers, an email is the most cost effective medium for sending information. It is also useful to announce new product launches, invite participation or sign-ups for workshops / seminars / webinars, notice for reminder of payments, notice for renewal of service.
The best part is that it does not require manual intervention to do all this. Once the marketing manager / team decide to send out a promotional email, or the accounts department has decided to send out the bulk / mass emails, what they only need is a smart presentation preferably in HTML format.