A special letter, email or message on a company's website can alert customers to a new product or service. Thank the recipient for being a customer and introduce the product or service. Describe the product or service and, if possible, enclose images that might help the customer understand what the company is offering.

If there is a promotional offer, tell the customer about it and inform him how to learn more. Remind the customer how valuable he is to your business and say that you hope he will try the new product or service.