E-mail marketing is the single most important thing you can do to grow your business online.
Why? Your customer list is your single most valuable asset. Without a customer list you will always be chasing after new business while ignoring your existing customers.
Customers who buy from you once are more likely to buy from you over and over.
The entire purpose is to drive new sales from existing customers and gain new ones.
It is imperative that you have an email marketing strategy to grow your business.
The company that I use is AWeber Email Marketing due to all of their features, customer support and low cost. You can also learn email marketing absolutely free by visiting their blog at blog.aweber.com