Your first 12,000 emails per month are always free. After that, you pay on a per-thousand-email basis. You'll never pay for more than you use. And we build discounts into our payment structure, so your per-email pricing automatically decreases as you send more email.
Mandrill was developed by MailChimp, a company with more than 10 years of experience building a robust email marketing platform. MailChimp sends 14 billion emails every month for more than 8 million customers.