Use word-of-mouth marketing

Word-of-mouth marketing is cheap and highly effective, and e-mail can be forwarded with a click of a mouse on the Net. If you're offering something of value, each person who sees your message may pass it on to half a dozen or more friends. Help this process along by specifically asking your readers to pass your information on if they find it useful. At the end of your electronic sales letters or brochures, simply ask readers to forward the information to others who may find it useful. You'll be surprised how far messages can travel this way.