Introduction
Postmark delivers and tracks your application email — a fast, reliable, care-free replacement for SMTP. Everything you need to integrate, from your first email to the full REST API.
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Send your first email in minutes. Pick your language, drop in the SDK, and go from install to a delivered message — five short steps.
TypeScript
Node.js
Python
Ruby
Rails
PHP
.NET
Java
Keep message streams separate: We send transactional and broadcast messages travel on different IP infrastructure, so your most critical emails make it to the inbox.
Verify your sender first. Confirm the address you're sending from before your first send.
10 MB max per email. Content, headers, and attachments combined.
50 recipients per message, combined. That's your total across To, CC, and BCC
Get running fast with an official or community Postmark library.
Detailed walkthroughs for accomplishing specific tasks.
Every HTTP request in Postmark’s REST API, in detail.
Instant JSON notifications when events happen in your account.
Using AI coding assistants? We’ve made it easy for them to help you work with Postmark — Agent Skills for Claude Code, Cursor, and Copilot; an llms.txt for context; the MCP server; and the CLI.
