MASS EMAILING WITH LAMBDA

Blog

Services

• Lambda
• SES
• IAM
• CloudWatch

Architecture

Steps

1. Create an IAM role

• Navigate to IAM and search for "Roles" in the side bar.
• Click "Create role"
• Leave Trusted entity type as "AWS service"
• Choose "Lambda" as the service to give permission to Lambda to perform actions in your account.
• Click "Next"
• Add the following permissions:
  • CloudWatch - FullAccess (not V2)
  • SES - FullAccess
• Click "Next"
• Enter role name as "MassEmailingRole"
• Review your configuration
• Click "Create role"

2. Create a Lambda Function

• Navigate to Lambda
• Create function
• Leave as "Author from scratch"
• Enter function name as "MassEmailingFunction"
• Choose the latest Python version as Runtime
• Click on "Change default execution role" dropdown
• Choose "Use an existing role"
• Choose an existing role "MassEmailingRole"
• Create Function

3. Configure SES

If you have already configured SES prior to this, feel free to skip this step

• Navigate to SES in the Management Console
• Create SMTP Credentials
• Click SMTP Credentials
• Create User (under smtp)
• Retrieve SMTP credentials by downloading a .csv file or by copying the credentials and storing them in a file.
• Click "Return to SES Console".
• Click Verified Identities
• Click "Create new identity"
• Set identity type to "email"
• Enter email address
• Click "Create Identity"
• To verify ownership of the identity, check the inbox of the email you entered.
• Click the link in the email to verify the email address.

3. Configure the Lambda Function

import boto3
import json

print("Loading Function...")

def lambda_handler(event, context):
    # Initialize the Simple Email Service (SES) client in the specified AWS region
    ses = boto3.client("ses", region_name="eu-west-2")
    
    # Define sender and recipient email addresses
    sender_email = '[email protected]'
    recipient_email = '[email protected]'
    
    # Compose email subject and message
    subject = "Mass emailing with Lambda"
    message = "You are one of the many recipients of this email."
    
    # Send email with SES
    response = ses.send_email(
        Source=sender_email,
        Destination={'ToAddresses': [recipient_email]},
        Message={'Subject': {'Data': subject}, 'Body': {'Text': {'Data': message}}}
    )
    print(response)
    
    return {
        'statusCode': 200,
        'body': json.dumps({'message': 'Email sent succesfully!'})
    }

• Configure test event
• Set Event name as "MyMassEmailingTest"
• Leave Event sharing settings as "Private"
• Click "save"
• Click "Deploy""
• Click "Test"

5. Create a CloudWatch Event

• Navigate to CloudWatch > Events > Rules
• Click "Create rule"
• Enter rule name as "MassEmailingRule"
• Choose "Rule type" as "Schedule"
• Click on "Continue to create rule"
• Choose "A schedule that runs at a regular rate, such as every 10 minutes."
• Enter rate as 2 minutes
• Click Next
• Select "target type" as lambda function
• Choose "MassEmailingFunction"
• Click on Skip to review and create
• Create Rule

Check your mail!!