Mailchimp

More than 6 million people use MailChimp to create, send, and track email newsletters. Whether you're self-employed, you manage projects for clients, or you work for a Fortune 500 company, MailChimp has features and integrations that will suit your email marketing needs.
Create signup forms that match your brand's look and feel, and send your subscribers product updates, event invitations, announcements, or editorial content. Use our reports to improve your campaigns and learn more about your readers. Best of all? MailChimp is free for lists of up to 2,000 subscribers.
Self-funded, self-motivated
MailChimp started as a side project in 2001. The Rocket Science Group had clients who were dissatisfied with the email-marketing landscape, so we made them something satisfying. MailChimp was funded by various web-development jobs, but over time, those jobs got in the way of MailChimp.
By then, we had enough customers to keep it afloat. No second mortgages, no credit card debt, no investors. We love seeing businesses start small, fund themselves with paying projects, and build up a strong API, so that's how we run MailChimp. As a result, we only answer to ourselves and our customers.
Since MailChimp is self-funded, profitable, and quickly growing, we spend our time improving our product and listening to the people who use it. We chart our own course, and relish the freedom to make bold decisions. Sometimes, that means using resources to build something necessary, like Mandrill. Other times, it means devoting time to improving the community around us.