README.md

postmark-python

The official (Beta) Python SDK for Postmark — send emails, manage bounces, templates, webhooks, and more.

For tutorials and detailed usage, check out the wiki.

For details about the Postmark API in general, see the Postmark developer docs.

Requirements

• Python 3.10+

Installation

Install from PyPI as postmark-python (the Python package you import is still postmark):

pip install postmark-python

Quick Start

The SDK is async-first — all API calls return awaitables. As of v0.3.0, a synchronous wrapper is also available for use in non-async contexts.

Async:

import asyncio
import os

import postmark

# Tokens are read from the environment here. Optionally: pip install python-dotenv,
# then use load_dotenv() to populate os.environ from a .env file.


async def main():
    async with postmark.ServerClient(os.environ["POSTMARK_SERVER_TOKEN"]) as client:
        response = await client.outbound.send(
            {
                "sender": "sender@example.com",
                "to": "recipient@example.com",
                "subject": "Hello from Postmark",
                "text_body": "Sent with the Postmark Python SDK.",
            }
        )
        print(f"Sent: {response.message_id}")


asyncio.run(main())

Sync (v0.3.0+):

import os

import postmark.sync

with postmark.sync.ServerClient(os.environ["POSTMARK_SERVER_TOKEN"]) as client:
    response = client.outbound.send(
        {
            "sender": "sender@example.com",
            "to": "recipient@example.com",
            "subject": "Hello from Postmark",
            "text_body": "Sent with the Postmark Python SDK.",
        }
    )
    print(f"Sent: {response.message_id}")

Why sender, not from? from is a reserved keyword in Python, so the SDK uses sender for the sending address. Everything else matches the Postmark API field names directly.

Two Client Types

Client	Token	Use for
ServerClient	Server API token	Sending email, bounces, templates, stats, webhooks, streams
AccountClient	Account API token	Domains, sender signatures, managing servers, data removals

import postmark

# Use as async context managers to ensure connections are closed
async with postmark.ServerClient(os.environ["POSTMARK_SERVER_TOKEN"]) as client:
    ...

async with postmark.AccountClient(os.environ["POSTMARK_ACCOUNT_TOKEN"]) as account:
    ...

# Or call close() explicitly when done
client = postmark.ServerClient(os.environ["POSTMARK_SERVER_TOKEN"])
await client.close()

Django

postmark.django.EmailBackend is a drop-in EMAIL_BACKEND for Django's django.core.mail, supporting Django 4.2 LTS through 6.1. Requires the django extra:

pip install postmark-python[django]

# settings.py
EMAIL_BACKEND = "postmark.django.EmailBackend"
POSTMARK_SERVER_TOKEN = "your-server-token"

See the Django Backend wiki page and examples/django/ for tags, metadata, attachments, and signals.

Development

git clone https://github.com/ActiveCampaign/postmark-python.git
cd postmark-python
poetry install
poetry run pre-commit install

# Run tests
poetry run pytest

# Lint and type-check
poetry run pre-commit run --all-files

Contributing

See CONTRIBUTING.md for setup, testing, and PR guidelines.

Support

• Issues: GitHub Issues
• Postmark Support: support@postmarkapp.com

License

MIT — see LICENSE.