Send email
Postmark
Email delivery service with REST API, SMTP, webhooks and inbound parsing for transactional and broadcast email.
Methods
| Method | Used for | How |
|---|---|---|
| Server API token | Sending, templates, message search, bounces, suppressions, stats, webhooks on one server | Header X-Postmark-Server-Token |
| Account API token | Creating and configuring servers, domains and sender signatures | Header X-Postmark-Account-Token |
| Test token | Validating sending requests without delivering mail | Send POSTMARK_API_TEST as the server token |
| Environment variable | Official MCP server | POSTMARK_SERVER_TOKEN |
Source4auth.md for agents
Getting access
- Who creates the account
- A person; there is no endpoint that issues tokens, and token creation is a manual step in the web interface4
- Where to get a key
https://account.postmarkapp.com/servers, then the API Tokens tab of a server4- Other requirements
- A verified sender signature or sending domain before real mail sends4
- OAuth
- None4
Read from ActiveCampaign’s own pages on 2026-11-04. Every number links to the page a value came from. For agents, the same facts as markdown: /tools/send-email/postmark.md