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Flaskframework~5 mins

Sending simple emails in Flask

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Introduction

Sending emails lets your app talk to users by sending messages automatically. It helps with notifications, confirmations, or alerts.

Send a welcome email when someone signs up.
Notify users about password changes.
Send alerts for important events or errors.
Confirm orders or bookings automatically.
Syntax
Flask
from flask_mail import Mail, Message

app.config['MAIL_SERVER'] = 'smtp.example.com'
app.config['MAIL_PORT'] = 587
app.config['MAIL_USE_TLS'] = True
app.config['MAIL_USERNAME'] = 'your-email@example.com'
app.config['MAIL_PASSWORD'] = 'your-password'

mail = Mail(app)

msg = Message(subject='Hello', sender='your-email@example.com', recipients=['friend@example.com'])
msg.body = 'This is a simple email sent from Flask.'
mail.send(msg)

Configure your mail server settings before sending emails.

Use Message to create the email content and recipients.

Examples
Sends a plain text email with a subject and body.
Flask
msg = Message(subject='Hi', sender='me@example.com', recipients=['you@example.com'])
msg.body = 'Hello there!'
mail.send(msg)
Sends an email with HTML content instead of plain text.
Flask
msg = Message(subject='Greetings', sender='me@example.com', recipients=['you@example.com'])
msg.html = '<b>Bold hello!</b>'
mail.send(msg)
Sample Program

This Flask app sends a simple email when you visit /send-email. It uses Gmail SMTP settings and Flask-Mail to send the message.

Flask
from flask import Flask
from flask_mail import Mail, Message

app = Flask(__name__)

app.config['MAIL_SERVER'] = 'smtp.gmail.com'
app.config['MAIL_PORT'] = 587
app.config['MAIL_USE_TLS'] = True
app.config['MAIL_USERNAME'] = 'your-email@gmail.com'
app.config['MAIL_PASSWORD'] = 'your-app-password'

mail = Mail(app)

@app.route('/send-email')
def send_email():
    msg = Message(subject='Test Email', sender=app.config['MAIL_USERNAME'], recipients=['friend@example.com'])
    msg.body = 'Hello! This is a test email sent from Flask.'
    mail.send(msg)
    return 'Email sent successfully!'

if __name__ == '__main__':
    app.run(debug=True)
OutputSuccess
Important Notes

Use app passwords or OAuth for Gmail instead of your main password for security.

Make sure less secure app access is enabled or use app-specific passwords if needed.

Test emails with a real SMTP server or a service like Mailtrap for development.

Summary

Configure mail server settings in your Flask app.

Create a Message object with subject, sender, recipients, and body.

Use mail.send() to send the email.