Transactional and marketing email delivery service with SMTP and API for developers.
What customers say
Postmark’s case describes Childcare.co.uk testing message-notification emails against Amazon SES before moving all transactional email to Postmark. Its CTO reports an 11% improvement in open rates in that test, not an…
Postmark reports that Blue Cat Reports uses its service to email daily dashboard summaries to customers. The founder attributes improved retention to these digest emails, reporting churn falling from sometimes…
Postmark reports that Mastodon switched providers after registration emails stalled during a signup surge. The team reports clearing 550,000 queued registration-related emails within hours; the story establishes ongoing…
Postmark releases v2.0 of MCP server with expanded AI integration tools
Postmark released version 2.0 of its Model Context Protocol (MCP) server, expanding its toolkit for managing transactional email within AI assistants. The update introduces 24 tools covering email sending, template management, message search, suppression handling, and delivery statistics. Notable additions include the diagnoseDelivery tool for automated delivery troubleshooting, improved security settings such as structured logging with masked email addresses, HTTPS enforcement for webhooks, and optional domain allowlisting.
Postmark launches synchronous support for Python SDK
Postmark released v0.3.0 of its official Python SDK. The update introduces a synchronous wrapper, allowing the library to be used in non-async contexts including standard scripts, Flask applications, and Jupyter Notebook environments.
