Python SDK | opensend-docs

OpenSend includes a minimal first-party Python SDK package at packages/python-sdk for Resend-shaped transactional email sends.

Use your OpenSend API key (os_...) with the Resend-compatible API surface.

Install

From this repository:

bash

python -m pip install ./packages/python-sdk

The package metadata is prepared for future publishing as opensend, but this change does not publish to PyPI.

Configure

Store API keys in environment variables; do not hardcode real keys.

bash

export OPENSEND_API_KEY="os_your_api_key"
export OPENSEND_BASE_URL="http://localhost:3015" # optional for self-hosting

If OPENSEND_BASE_URL is unset, the SDK targets https://api.opensend.com.

Send

python

import os
import opensend

opensend.api_key = os.environ["OPENSEND_API_KEY"]
opensend.base_url = os.environ.get("OPENSEND_BASE_URL", opensend.DEFAULT_BASE_URL)

params: opensend.Emails.SendParams = {
    "from": "hello@yourdomain.com",
    "to": "recipient@example.com",
    "subject": "Hello from OpenSend",
    "html": "# It works!",
}

email = opensend.Emails.send(params)
print(email["id"])

Batch send

python

result = opensend.Emails.send_batch([
    {
        "from": "hello@yourdomain.com",
        "to": "a@example.com",
        "subject": "Hello A",
        "html": "
A
",
    },
    {
        "from": "hello@yourdomain.com",
        "to": "b@example.com",
        "subject": "Hello B",
        "html": "
B
",
    },
])

Errors

Non-2xx responses raise opensend.OpenSendError with status_code, name, code, message, and details fields when the OpenSend API error envelope includes them.