Postmark

Based in Illinois, US, and founded by Natalie Nagele in 2010, Postmark is a software-as-a-service company that provides transactional emails like password resets, welcome emails, and newsletters. Its business model hinges on delivering emails to inboxes in seconds. In May 2022, ActiveCampaign, LLC, a portfolio company of Dragoneer Investment Group, Silversmith Capital Partners, Susquehanna Growth Equity, and Tiger Global Management, acquired Wildbit, LLC.   Postmark's API libraries are available for a wide range of programming languages, integrating the service into any stack.

The service offers content-ready email templates that look great in all major email clients, and it keeps 45 days of full content history, recipient information, and message events by default to help users troubleshoot any issues that may arise. The company’s API and SMTP service help users send emails, whether they are sending password reset emails, notifications, newsletters, or other types of emails. Postmark also offers a free developer tier that includes 100 monthly emails and accepts payments via Visa, MasterCard, American Express, Diners, and JCB. The company generates revenue from its services, with pricing beginning at USD 15 per month for a package that includes 10,000 emails.