Flask-Mail Example

mail_handler

import os

from flask import Flask, render_template
from flask_mail import Mail, Message
from lepl.apps.rfc3696 import Email # $ pip install lepl


app = Flask(__name__)
app.config.update({
    'MAIL_SENDER' : os.environ.get('MAIL_SENDER_EMAIL'),
    'MAIL_SERVER' : 'smtp.mail.yahoo.com',
    'MAIL_PORT' : '587',
    'MAIL_USE_TLS' : 'True',
    'MAIL_USE_SSL' : 'False',
    'MAIL_USERNAME' : os.environ.get('MAIL_USERNAME'),
    'MAIL_PASSWORD' : os.environ.get('MAIL_PASSWORD')})

# Instantiate Flask-Mail Flask extension
mailer = Mail(app)

# email address format validator
validator = Email()


def validate_email(email):
    if validator(email):
        return email



def send_email(app, recipients, message, sender=None, subject="Hello there!"):
    # if `recipients`is passed as a string or unicode,
    # replace commas and/or semi-colons with
    # whitespaces and split (around the whitespaces)
    # the string into a list of recipients
    if isinstance(recipients, basestring):
        recipients = recipients.replace(',', ' ').replace(';', ' ').split()
        recipients = [email for email in recipients.split() if
                        validate_email(email) is not None]

    if sender is None:
        sender = app.config.get('MAIL_SENDER')
    try:
        mail_msg = Message(
            subject=subject,
            recipients=recipients,
            html=message,
            sender=sender
        )

        mailer.send(mail_msg)
        return True
    except:
        print 'Error formatting and sending email!' # DEBUG
        return False


def format_msg_html():
    # ...
    return render_template('email_html.html')


@app.route('/registration-complete', methods=['GET', 'POST'])
def on_signup_success():
    # ... User signup completed
    send_email(app, ['me@you.us'], format_msg_html())