AWS SES Service Integrated in .Net Application Not Working

I understand you're experiencing issues with sending emails through Amazon SES after a security incident. Let's go through some steps to troubleshoot and resolve this problem:

1. Verify your new credentials: Ensure that you're using the correct new SMTP credentials in your .NET application. Remember that SMTP credentials are different from your AWS access keys.

2. Check your sending limits: After a security breach, AWS might have reset your sending quotas. Verify if you have sufficient quota to send emails.

3. Verify your email addresses and domains: Confirm that the email addresses and domains you're using to send emails are still verified in Amazon SES.

4. Review your application's configuration: Make sure your .NET application is correctly configured to use the new credentials and the proper Amazon SES SMTP endpoint.

5. Test with the Amazon SES console: Try sending a test email directly from the Amazon SES console to isolate whether the issue is with your application or the SES service itself.

6. Check for any remaining restrictions: Ensure that all restrictions placed during the security incident have been lifted from your account.

7. Verify SMTP connection: Ensure your application can establish a connection to the Amazon SES SMTP endpoint using the correct port (usually 587 or 465 for TLS).

8. Review error messages: If your application is receiving any error messages when trying to send emails, analyze these for clues about the specific issue.

9. Consider using the Amazon SES API: If SMTP continues to be problematic, you might want to switch to using the Amazon SES API through the AWS SDK for .NET.

If you're still unable to send emails after going through these steps, you should contact AWS Support for further assistance, as they will have more detailed information about your account status and any remaining issues following the security incident.
Sources
Using the Amazon SES SMTP interface to send email - Amazon Simple Email Service
Using the Amazon SES SMTP interface to send email - Amazon Simple Email Service
Sending email with Amazon SES - Amazon Simple Email Service

Hi Jimit

After AWS reactivated your SES services post-security breach, follow these quick steps to restore email functionality:

• Check IAM Permissions: Ensure proper permissions like ses:SendEmail are assigned.
• Verify Domains/Emails: Confirm all email addresses/domains are still verified in SES.
• Review SES Limits: Make sure your account isn’t in sandbox mode and that sending limits are adequate.
• Monitor CloudWatch: Look for SES-related errors or SNS notifications indicating delivery issues.
• Update Credentials: Verify the new credentials are correctly configured in your .NET app.