SES issue - Email bouncing

It sounds like you're experiencing issues with email delivery using Amazon SES. There are several potential causes and steps you can take to troubleshoot and resolve this problem:

1. Check the suppression list: Some email addresses may be on your account's suppression list, preventing delivery. You can use the AWS CLI to view and manage entries on this list.

2. Verify sender and recipient addresses: Ensure that the sender's email address (the "From" address) and the Return-Path address are valid. Invalid addresses can cause bounces.

3. Review bounce messages: Check the Return-Path address for any bounce messages, which should contain explanatory error messages about why the delivery failed.

4. Examine SES configuration: Verify that your SES receipt rules are correctly set up, especially if you're using S3 buckets or Lambda functions to process incoming emails.

5. Check DNS records: Ensure your domain's DNS records, including MX and SPF records, are correctly configured according to SES documentation.

6. Monitor AWS Service Health: Check the AWS Service Health Dashboard to confirm there are no known issues with Amazon SES.

7. Implement logging: Enable detailed logging on associated services (like S3 or Lambda) to gather more information about where emails might be failing in the delivery process.

8. Gradual testing: Try sending simple text emails from your domain to test the basic receiving flow.

If you're still experiencing issues after these steps, it may be helpful to open a technical support case with AWS, providing detailed information about the problem, including recipient addresses and any error messages you've received.

Remember that maintaining a positive sender reputation is crucial for successful email delivery with SES. Keep monitoring your bounces and adjust your sending practices accordingly to improve deliverability.

Sources
Amazon SES Delivery problems - Amazon Simple Email Service
Returned/Bounced Emails | AWS re:Post
SES receive email not working. | AWS re:Post