Is $2&#x2F;mo or $10&#x2F;year enough to make a viable business and living?<p>I love, love this idea and how you&#x27;ve done it. But I&#x27;d be really sad to see the service take off and you can&#x27;t support it because the model doesn&#x27;t work.<p>I just worry about you charging a flat rate for something that has a variable cost (email). That&#x27;s assuming you&#x27;re using a service like Mandrill or SendGrid and not rolling your own.<p>Anyway, kudos. I love the looks of this and will probably be a paying customer several times over.