Introduction

Sending email attachments is a common requirement in many applications, whether for sending invoices, reports, or confirmation documents. Amazon Simple Email Service (Amazon SES) is a highly scalable and cost-effective email service offered by Amazon Web Services (AWS) tailored for such tasks. In this article, we'll explore how to send email attachments using Amazon SES, covering both the SMTP interface and the SES API.

Amazon SES Overview

Amazon SES is a cloud-based, reliable email service that supports sending, receiving, and monitoring email to customers. It is fully managed and simplifies the process of sending both transactional and marketing emails. Key features include:

• High Deliverability: Ensures your emails land in your customers’ inbox rather than the spam folder.
• Scalability: Easily handle large email volumes as your business grows.
• Cost-Effectiveness: Pay-as-you-go pricing model without upfront costs.
• Security: Integrates with AWS security services like AWS KMS for encryption.

Sending Attachments using SMTP Interface

The SMTP interface of Amazon SES is akin to traditional email servers, which makes it compatible with existing email clients and libraries. To send attachments via SMTP:

Step by Step Guide

1. Configure SMTP Client:
   • Obtain your SMTP credentials from the AWS SES console.
   • Set the SMTP Host as email-smtp.``<region>``.amazonaws.com (replace ``<region>`` with your AWS region).
   • Use ports 25, 465 or 587 for SMTP connection.
2. Structure the Email with Attachments:
   • Use a mail library, such as Python smtplib or JavaMail API, to create a MIME container for your message.
   • Attach files using the MIMEBase and MIMEApplication subclasses.
   • Example with Python's smtplib:
   • Use AWS SDKs like Boto3 (Python), AWS SDK for Java, etc., to integrate with SES.
   • AWS SES supports sending raw emails via the SendRawEmail API for sending attachments.
   • Use MIME format to encode the email content, including attachments.

• Attachment Size Limits: SES imposes a maximum message size limit of 10 MB, including the email body and attachments.
• Entity Encoding: Always use base64 encoding for binary attachments to ensure compatibility.
• Security: Ensure your SES configuration complies with domain verification and DKIM for better deliverability and security.