Postmark

Postmark is a transactional email delivery service designed for developers and businesses that need reliable, fast email delivery for application-generated emails such as password resets, order confirmations, notifications, and more. Founded in 2010 by Wildbit, Postmark quickly gained a reputation for its high deliverability rates and simple API. In 2020, Postmark was acquired by ActiveCampaign, a marketing automation platform, to enhance its email infrastructure. Postmark distinguishes itself by focusing solely on transactional emails, avoiding bulk marketing emails, which helps maintain high sender reputation. Its features include a robust REST API, webhook support, message templates, spam checking, and detailed analytics. The service is built on a scalable infrastructure that guarantees 99.9% uptime and low latency. The domain postmarkapp.com has been registered since 2009 and uses Cloudflare for CDN and DDoS protection. Its email infrastructure relies on Google Workspace for MX records and Amazon Route53 for DNS. With a global traffic rank of around 24,771, Postmark serves thousands of businesses worldwide. Postmark's target audience includes developers, SaaS companies, e-commerce platforms, and any organization that sends high volumes of transactional emails. It competes with SendGrid, Amazon SES, and Mailgun. Postmark's commitment to delivery transparency and customer support has earned it a loyal following. The company is headquartered in Chicago, Illinois, and operates as a subsidiary of ActiveCampaign. While the exact revenue is not public, ActiveCampaign raised over $400 million in funding, indicating substantial revenue. Overall, Postmark remains a top choice for transactional email delivery due to its reliability, developer-friendly API, and focus on deliverability.