Your BEST salespeople are your current customers. Help mobilize them to promote your service by giving them an email they can forward to other potential customers (...assuming you don’t suck). The key thing to recognize is what this email could do for their reputation. The more badass your message makes them look, the higher chance you have of them forwarding it. Your reader doesn’t want to think too much – make it easy for them by suggesting the person or category of people you want them to forward the email to. To keep things in perspective, ask yourself what you’d do if you received that email.