Having multiple touches with your customers is key, and what better way to do it than with an eNewsletter. An email newsletter can be a very effective and inexpensive marketing tool that any business can use to promote a new product or service, communicate to your customers. The hard part of running a successful email newsletter campaign is that it is a science, and getting all of the variables right is more difficult than you might think. Most particularly, timing is key but often difficult to determine.