---
id: postmarker
version: "1.0"
license: MIT
license_treatment: permissive
maintenance: aging
---

# postmarker — Python client library for Postmark API

License: permissive · Maintenance: aging · Downloads: 999.8K/mo

## What it is and what it does

Postmarker wraps the Postmark email service API in a Python client, letting you send emails, manage templates, track bounces, and handle inbound/delivery webhooks without writing raw HTTP requests. It supports both single and batch email sends, file attachments, custom headers, and integrates with Django as an email backend and Tornado as a helper.

The library depends only on requests and has low install friction. It's stable and production-ready (Development Status 5), though maintenance is infrequent—the last release was in January 2022. It works with CPython 3.6–3.10 and PyPy 3.7–3.8 as documented, but has not been updated for newer Python versions.

Use it for:

- Send transactional emails from a Python application using Postmark's infrastructure and delivery guarantees.
- Batch-send newsletters or notifications to multiple recipients in a single API call.
- Integrate email sending into a Django project using Postmarker as the email backend.
- Track email bounces and delivery events by setting up webhook handlers for Postmark events.
- Send emails with attachments and custom headers for complex email workflows.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Postmarker is a Python client library for the Postmark email API, enabling you to send single and batch emails, manage templates, handle bounces, and integrate webhooks.

Yes, if you use Postmark for email delivery and need a Python client. The library is stable (MIT license, no known vulnerabilities), has low install friction, and covers the core Postmark API. However, be aware that maintenance is infrequent—the last release was January 2022—so if Postmark has added new API features since then, this library may not expose them. Verify that it supports the Postmark features you need before committing.

## Install

pip install postmarker
uv add postmarker
poetry add postmarker

## Installing postmarker

Before you install: Low install friction with a single runtime dependency (requests). The package is in aging maintenance status—last release was in January 2022 and the last commit was September 2025, so it receives infrequent updates but the repository remains active and not archived.

License in practice: MIT license (permissive) means you can use, modify, and distribute this package freely in commercial and private projects with minimal restrictions.

Quickstart:

pip install postmarker

from postmarker.core import PostmarkClient
postmark = PostmarkClient(server_token='API_TOKEN')
postmark.emails.send(
    From='sender@example.com',
    To='receiver@example.com',
    Subject='Test',
    HtmlBody='Hello'
)

You need a valid Postmark API token (server_token) to authenticate with the Postmark service.

Verify before relying:

- Whether the package works reliably with Python versions newer than 3.10, given the last release was January 2022.
- Current status of Postmark API compatibility—whether the library covers all current Postmark endpoints.

## Package facts

- License: MIT (permissive)
- Python support: unspecified
- Install friction: low
- Maintenance: aging
- Downloads: 999.8K/month (top 5,000 on PyPI)
- Known vulnerabilities: none known

## Tags

postmark email api client, send emails python postmark, postmark email service integration, batch email sending python, postmark webhook handling, email template management api, postmark bounce tracking, email-delivery, postmark-integration, transactional-email

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