Postmark

Postmark is a transactional email delivery service known for its exceptional deliverability rates and speed, delivering emails to the inbox within seconds rather than minutes. Founded in 2010 and now part of ActiveCampaign, the service maintains dedicated infrastructure that separates transactional email traffic from bulk and promotional email, ensuring that critical emails like password resets, order confirmations, and security alerts are never delayed by marketing campaigns. The Message Streams feature provides separate sending pipelines for transactional and broadcast emails, each with its own reputation tracking, domain authentication, and delivery analytics. The REST API and SMTP interface support templated emails with Handlebars variables, inline CSS processing, attachment handling, and link tracking. Webhooks deliver real-time notification of opens, clicks, bounces, spam complaints, and deliveries for pipeline integration. Inbound email processing parses incoming messages and forwards them to application webhooks as structured JSON, enabling helpdesk and support ticket systems built entirely on email. The platform reports a 95 percent customer happiness score based on thousands of monthly support interactions, with live chat support available across all plans. Analytics provide delivery rates, bounce rates, spam complaint rates, open rates, and click rates broken down by message stream and email type. Postmark Skills provides structured documentation for AI coding agents, enabling tools like Claude and Cursor to implement email functionality programmatically. Customers include Paddle, Indie Hackers, Faire, Minecraft, 1Password, Wistia, Betterment, Webflow, InVision, and Steven Tey. Pricing starts at 15 dollars per month for 10,000 emails.