Asynchronous mail sending using Amazon SES

async-mailer.py

#!/usr/bin/python
# install boto using pip

import types
from threading import Thread
from boto import (
    ses,
    connect_s3
)

# Amazon AWS config and credentials
DEFAULT_AWS_REGION = "eu-west-1"
AWS_ACCESS_KEY = "<Your-AWS-access-key>"
AWS_SECRET_KEY = "<Your-AWS-secret-key>"

# create an connection for SES AWS service with default region
ses_conn = ses.connect_to_region(
    DEFAULT_AWS_REGION,
    aws_access_key_id=AWS_ACCESS_KEY,
    aws_secret_access_key=AWS_SECRET_KEY
)

def async(f):
    def wrapper(*args, **kwargs):
        thr = Thread(target=f, args=args, kwargs=kwargs)
        thr.start()
    return wrapper


@async
def send_email(_from, to, subject, body):
    """Function to send email through Amazon AWS SES service
    :param _from: a source email
    :param to: a list of recipients or a single email of recipient
    :param subject: a subject text
    :param body: a body text or html
    :return: None
    """
    recipients = []

    # if a single recipient
    if isinstance(to, types.StringTypes):
        recipients.append(to)
    else:
        recipients = to

    try:
        # send mail
        ses_conn.send_email(
            source=_from,
            subject=subject,
            body=body,
            to_addresses=recipients,
            format='html'
        )
        print "Email sent successfully to %s" % recipients

    except Exception as e:
        raise Exception("Problem in sending email :: %s" % str(e))


if __name__ == '__main__':
    # to send email one recipient
    send_email("noreply@testing.com",
               "user@testing.com",
               "Test Async Mail",
               "Hi, I am tesing this gist.")

    # to send email multiple recipients
    send_email("noreply@testing.com",
               ["user1@testing.com", "user2@testing.com"],
               "Test Async Mail",
               "Hi, I am tesing this gist.")