Are you marketing regularly to your customers? Some of you may say yes because you have a store up. Well, that’s not enough. E-mail marketing to your customers who have opted-in to regular updates is essential to your success. It is the best tool to use to let your customers know about specials, new products, and other updates to your store. Below are several very well respected companies with excellent e-mail autoresponders. Some of them also offer other services such as newsletters and the ability to survey your customers.