# Postmark AI integration on Definable

> Postmark is an email delivery service that enables developers to send transactional emails with high deliverability and detailed analytics.

## What this connects

Postmark is an email delivery service that enables developers to send transactional emails with high deliverability and detailed analytics.

Vendor: https://postmarkapp.com

## Tools available

**46** tools available. First 12:

- `POSTMARK_ARCHIVE_MESSAGE_STREAM` — Archive Message Stream — Tool to archive a message stream (soft delete). Use when you need to remove a message stream that will be permanently deleted after 45 days.
- `POSTMARK_CHECK_SPAM_SCORE` — Check Spam Score — Tool to assess the spam score of a raw email via the SpamCheck API. Use when you have full email source and need spam scoring before sending. Returns spam score and detailed report.
- `POSTMARK_CREATE_INBOUND_RULE` — Create Inbound Rule — Tool to create a new inbound rule trigger to block email from a specific sender or domain. Use when you need to prevent emails from specific addresses or domains from being processed.
- `POSTMARK_CREATE_MESSAGE_STREAM` — Create Message Stream — Tool to create a new message stream. Use when you need to set up separate streams for transactional or broadcast emails.
- `POSTMARK_CREATE_SUPPRESSIONS` — Create Suppressions — Tool to add email addresses to the suppression list for a message stream. Use when you need to prevent emails from being sent to specific addresses.
- `POSTMARK_CREATE_TEMPLATE` — Create Template — Tool to create a new email template. Use when you need reusable templates before sending emails.
- `POSTMARK_CREATE_WEBHOOK` — Create Webhook — Tool to create a new webhook configuration for Postmark. Use when you need to set up a webhook to receive event notifications for email tracking (opens, clicks, bounces, deliveries, etc.).
- `POSTMARK_DELETE_INBOUND_RULE` — Delete Inbound Rule — Tool to delete a specific inbound rule trigger. Use when you need to remove an inbound rule by its ID after confirming it's no longer needed.
- `POSTMARK_DELETE_SUPPRESSIONS` — Delete Suppressions — Tool to remove email addresses from the suppression list for a message stream. Use when you need to reactivate previously suppressed email addresses. Note that only HardBounce and ManualSuppression types can be deleted; SpamComplaint suppressions cannot be removed.
- `POSTMARK_DELETE_TEMPLATE` — Delete Template — Tool to delete a template by its ID or alias. Use when you need to permanently remove a template after confirming it's no longer needed.
- `POSTMARK_DELETE_WEBHOOK` — Delete Webhook — Tool to delete a specific webhook. Use when you need to remove a webhook by its ID after confirming it's no longer needed.
- `POSTMARK_EDIT_SERVER` — Edit Server — Tool to update settings for the current Postmark server. Use when you need to modify server configuration.

## Auth

Auth schemes: `API_KEY`.

## How agents use Postmark

Inside a Definable workflow, Postmark is one of the tools the **Distributor specialist** can call. Example coordination patterns:

- **Researcher → Postmark** — the Researcher (GPT-5.5) pulls context from Postmark (records, threads, documents), synthesises findings, and briefs the rest of the team.
- **Writer → Distributor → Postmark** — the Writer (Claude Opus 4.7) drafts copy in brand voice, the Verifier passes it, then the Distributor writes the result into Postmark (create record, post message, draft email).
- **Designer / Engineer → Distributor → Postmark** — the Designer ships an asset or the Engineer ships a code change, the Distributor delivers it via Postmark (attach file, open PR comment, post status).

The Verifier checks every Postmark call. On rate limit, schema drift, or auth refresh it self-heals and retries — the workflow completes without manual intervention.

## Categories

- transactional email — https://definable.ai/apps/category/transactional-email/
- email — https://definable.ai/apps/category/email/

## Related

- HTML page: https://definable.ai/apps/postmark/
- Same category (transactional email): https://definable.ai/apps/category/transactional-email/
- All integrations: https://definable.ai/apps/
- Workflow (multi-agent loop): https://definable.ai/workflow/
- Apps llms.txt index: https://definable.ai/llms-apps.txt