Python SDK for the Mailnow email API - send emails programmatically with a simple, type-safe interface
Project description
Mailnow Python SDK
A simple, type-safe Python SDK for the Mailnow email API. Send emails programmatically with just a few lines of code.
Features
- 🚀 Simple, intuitive API
- 🔒 Type-safe with full type hints
- ✅ Comprehensive input validation
- 🎯 Detailed error handling
- 📝 Extensive documentation
- 🧪 Thoroughly tested
Installation
Install the SDK using pip:
pip install py-mailnow
Quick Start
from mailnow import MailnowClient
# Initialize the client with your API key
client = MailnowClient(api_key="mn_live_7e59df7ce4a14545b443837804ec9722")
# Send an email
response = client.send_email(
from_email="sender@example.com",
to_email="recipient@example.com",
subject="Hello from Mailnow!",
html="<h1>Welcome!</h1><p>This is your first email.</p>"
)
print(f"Email sent! Message ID: {response['message_id']}")
API Key Format
Your Mailnow API key must be in one of the following formats:
- Production:
mn_live_followed by your unique key (e.g.,mn_live_7e59df7ce4a14545b443837804ec9722) - Testing:
mn_test_followed by your unique key (e.g.,mn_test_abc123def456)
You can find your API key in your Mailnow dashboard.
Usage Examples
Basic Email Sending
from mailnow import MailnowClient
client = MailnowClient(api_key="mn_live_7e59df7ce4a14545b443837804ec9722")
response = client.send_email(
from_email="noreply@yourcompany.com",
to_email="customer@example.com",
subject="Welcome to Our Service",
html="<h1>Welcome!</h1><p>Thanks for signing up.</p>"
)
print(response)
# Output: {'success': True, 'message_id': 'msg_abc123', 'status': 'queued'}
With Error Handling
from mailnow import (
MailnowClient,
MailnowError,
MailnowValidationError,
MailnowAuthError,
MailnowRateLimitError,
MailnowServerError,
MailnowConnectionError
)
client = MailnowClient(api_key="mn_live_7e59df7ce4a14545b443837804ec9722")
try:
response = client.send_email(
from_email="sender@example.com",
to_email="recipient@example.com",
subject="Important Update",
html="<p>Your account has been updated.</p>"
)
print(f"✓ Email sent successfully: {response['message_id']}")
except MailnowValidationError as e:
print(f"✗ Validation error: {e}")
# Handle invalid input (missing fields, invalid email format, etc.)
except MailnowAuthError as e:
print(f"✗ Authentication error: {e}")
# Handle invalid or expired API key
except MailnowRateLimitError as e:
print(f"✗ Rate limit exceeded: {e}")
# Implement exponential backoff or retry logic
except MailnowServerError as e:
print(f"✗ Server error: {e}")
# Retry the request after a delay
except MailnowConnectionError as e:
print(f"✗ Connection error: {e}")
# Check network connectivity
except MailnowError as e:
print(f"✗ Unexpected error: {e}")
# Catch any other SDK errors
Sending HTML Emails
from mailnow import MailnowClient
client = MailnowClient(api_key="mn_live_7e59df7ce4a14545b443837804ec9722")
html_content = """
<!DOCTYPE html>
<html>
<head>
<style>
body { font-family: Arial, sans-serif; }
.header { background-color: #4CAF50; color: white; padding: 20px; }
.content { padding: 20px; }
</style>
</head>
<body>
<div class="header">
<h1>Welcome to Our Newsletter</h1>
</div>
<div class="content">
<p>Hello,</p>
<p>Thank you for subscribing to our newsletter!</p>
<p>Best regards,<br>The Team</p>
</div>
</body>
</html>
"""
response = client.send_email(
from_email="newsletter@yourcompany.com",
to_email="subscriber@example.com",
subject="Welcome to Our Newsletter",
html=html_content
)
Handling Multiple Recipients
from mailnow import MailnowClient, MailnowError
client = MailnowClient(api_key="mn_live_7e59df7ce4a14545b443837804ec9722")
recipients = [
"user1@example.com",
"user2@example.com",
"user3@example.com"
]
for recipient in recipients:
try:
response = client.send_email(
from_email="notifications@yourcompany.com",
to_email=recipient,
subject="System Notification",
html="<p>This is an automated notification.</p>"
)
print(f"✓ Sent to {recipient}: {response['message_id']}")
except MailnowError as e:
print(f"✗ Failed to send to {recipient}: {e}")
continue
Exception Types
The SDK provides detailed exception types for different error scenarios:
MailnowError
Base exception for all Mailnow SDK errors. Catch this to handle any SDK-related error.
try:
client.send_email(...)
except MailnowError as e:
print(f"SDK error: {e}")
MailnowValidationError
Raised when input validation fails. This includes:
- Missing or empty required parameters (
from_email,to_email,subject,html) - Invalid email address format
- Invalid API key format
- API returns 400 Bad Request
try:
client.send_email(
from_email="invalid-email", # Invalid format
to_email="user@example.com",
subject="Test",
html="<p>Test</p>"
)
except MailnowValidationError as e:
print(f"Validation error: {e}")
MailnowAuthError
Raised when authentication fails. This includes:
- Missing or None API key
- Empty API key
- Invalid API key format (doesn't start with
mn_live_ormn_test_) - API returns 401 Unauthorized
try:
client = MailnowClient(api_key="invalid_key")
except MailnowAuthError as e:
print(f"Authentication error: {e}")
MailnowRateLimitError
Raised when rate limit is exceeded (API returns 429 Too Many Requests). Consider implementing exponential backoff retry logic.
import time
try:
client.send_email(...)
except MailnowRateLimitError as e:
print(f"Rate limit exceeded: {e}")
time.sleep(60) # Wait before retrying
MailnowServerError
Raised when the Mailnow API experiences an internal error (5xx status codes). Consider retrying the request after a delay.
import time
max_retries = 3
for attempt in range(max_retries):
try:
response = client.send_email(...)
break
except MailnowServerError as e:
if attempt < max_retries - 1:
time.sleep(2 ** attempt) # Exponential backoff
continue
raise
MailnowConnectionError
Raised when network connection fails. This includes:
- Network connection cannot be established
- Request times out
- DNS resolution fails
- Any other network-level error
try:
client.send_email(...)
except MailnowConnectionError as e:
print(f"Connection error: {e}")
# Check network connectivity or retry
Type Hints and mypy Compatibility
The Mailnow SDK is fully type-annotated and compatible with mypy for static type checking. All public APIs include comprehensive type hints.
Running Type Checks
# Install mypy
pip install mypy
# Run type checking on your code
mypy your_script.py
Example with Type Hints
from typing import Dict, Any
from mailnow import MailnowClient
def send_welcome_email(client: MailnowClient, user_email: str) -> Dict[str, Any]:
"""Send a welcome email to a new user."""
return client.send_email(
from_email="welcome@yourcompany.com",
to_email=user_email,
subject="Welcome!",
html="<h1>Welcome to our platform!</h1>"
)
# mypy will catch type errors
client: MailnowClient = MailnowClient(api_key="mn_live_abc123")
response: Dict[str, Any] = send_welcome_email(client, "user@example.com")
API Reference
MailnowClient
Main client class for interacting with the Mailnow API.
__init__(api_key: str) -> None
Initialize the Mailnow client.
Parameters:
api_key(str): Your Mailnow API key (format:mn_live_*ormn_test_*)
Raises:
MailnowAuthError: If API key is invalid or missing
send_email(from_email: str, to_email: str, subject: str, html: str) -> Dict[str, Any]
Send an email via the Mailnow API.
Parameters:
from_email(str): Sender email address (must be valid format)to_email(str): Recipient email address (must be valid format)subject(str): Email subject line (cannot be empty)html(str): HTML content of the email (cannot be empty)
Returns:
Dict[str, Any]: Response dictionary containing:success(bool): Whether the email was successfully queuedmessage_id(str): Unique identifier for the messagestatus(str): Current status (e.g., "queued")
Raises:
MailnowValidationError: Invalid input parametersMailnowAuthError: Authentication failureMailnowRateLimitError: Rate limit exceededMailnowServerError: Server error (5xx)MailnowConnectionError: Network connection error
Requirements
- Python 3.12 or higher
- httpx >= 0.27.0
Development
Installing Development Dependencies
pip install py-mailnow[dev]
Running Tests
pytest
Running Type Checks
mypy mailnow
Code Formatting
black mailnow tests
ruff check mailnow tests
License
This project is licensed under the MIT License.
Support
- Documentation: GitHub README
- Issues: GitHub Issues
- Website: mailnow.xyz
Contributing
Contributions are welcome! Please feel free to submit a Pull Request.
Release history Release notifications | RSS feed
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