zasend

Official Python client for the zaSend transactional email API.

zaSend is a developer-focused email delivery service for sending product, auth, billing, notification, and lifecycle emails from your application. This package is a small wrapper around the zaSend REST API for Python apps, Django, Flask, FastAPI, background jobs, and scripts.

Use it to:

• Send transactional email from verified domains
• Send template-based email with variables
• Check message status and events
• Manage suppressions, webhooks, templates, and domains
• Verify zaSend webhook signatures

The client stays close to the raw API. It has no heavy framework dependencies and uses requests.

Install

pip install zasend

Quick Start

from zasend import ZaSend

client = ZaSend(api_key="sk_live_...")

result = client.send_email(
    from_email="zaSend <noreply@zasend.com>",
    to="user@example.com",
    subject="Welcome",
    text="Thanks for signing up.",
)

print(result["message_id"])

You can use an Account API Key (sk_live_...) for all methods. A Domain Sending Key (dsk_live_...) is restricted to sending email from one verified domain.

Send HTML Email

client.send_email(
    from_email="Acme <noreply@acme.com>",
    to="customer@example.com",
    subject="Your receipt",
    html="<h1>Thanks for your order</h1><p>Your receipt is attached.</p>",
    text="Thanks for your order. Your receipt is attached.",
)

Send to Multiple Recipients

client.send_email(
    from_email="Acme <noreply@acme.com>",
    to=["one@example.com", "two@example.com"],
    subject="Product update",
    text="A new update is available.",
)

zaSend returns one queued message per to recipient. Suppressed recipients reject the whole request so you can fix the list before sending.

Template Send

client.send_template_email(
    from_email="Acme <noreply@acme.com>",
    to="customer@example.com",
    template="welcome",
    variables={"name": "Ada"},
)

Django Example

# settings.py
ZASEND_API_KEY = "sk_live_..."

# anywhere in your app
from django.conf import settings
from zasend import ZaSend

zasend = ZaSend(settings.ZASEND_API_KEY)
zasend.send_email(
    from_email="Acme <noreply@acme.com>",
    to=user.email,
    subject="Reset your password",
    text="Use this link to reset your password.",
)

Flask or FastAPI Example

import os
from zasend import ZaSend

zasend = ZaSend(os.environ["ZASEND_API_KEY"])

def send_signup_email(email):
    return zasend.send_template_email(
        from_email="Acme <noreply@acme.com>",
        to=email,
        template="welcome",
        variables={"product": "Acme"},
    )

Webhook Verification

zaSend signs webhook payloads with HMAC-SHA256. Verify the raw request body before trusting webhook data.

from zasend import verify_webhook_signature

ok = verify_webhook_signature(
    request.get_data(),
    "whsec_...",
    request.headers.get("X-zaSend-Signature"),
)

API Methods

Error Handling

from zasend import APIError, RateLimitError, ValidationError, ZaSend

try:
    ZaSend("sk_live_...").send_email(
        from_email="Acme <noreply@acme.com>",
        to="user@example.com",
        subject="Hello",
        text="Body",
    )
except RateLimitError as exc:
    print("Rate limited:", exc)
except ValidationError as exc:
    print("Invalid request:", exc)
except APIError as exc:
    print("zaSend API error:", exc)

Links

• Website: zasend.com
• API documentation: zasend.com/docs
• Source: GitHub

License

MIT