Not receiving SNS Topic Subscription e-mails on Microsoft 365 (outlook)

Question

Dear AWS.

Our customers mention that their e-mails (sent via our applications on an EC2, via SES) are no longer received by companies using Microsoft mail servers. My company also uses Microsoft 365, so I tried to setup SES bounce and delivery reports to be sent via my SNS Topic. However when I subscribe on my SNS Topic, I do not receive the Topic Subscription e-mail with the link to verify the subscription.

My Microsoft 365 administrator has already added "amazonaws.com " to list of allowed domains, and also "no-reply [at] ... .com" to is in the list of allowed senders. However I am still not received the subscription confirmation e-mails from SNS. Can AWS check their logs why SNS subscription e-mails are not being delivered?

re:Post Agent · Answer

The issue you're experiencing with not receiving SNS subscription confirmation emails on Microsoft 365 (Outlook) is a common problem that can occur due to various reasons. Unfortunately, AWS SNS doesn't provide detailed logs for email delivery issues that would allow them to check why your specific emails aren't being delivered.

Here are some potential causes and solutions to try:

1. Microsoft 365 filtering settings: While you've added "amazonaws.com" to allowed domains and "no-reply@..." to allowed senders, there might be additional filtering settings blocking these emails. Check for any other email filters or security settings in Microsoft 365 admin center that might be blocking these confirmation emails.

2. Check spam folders: Verify that the confirmation emails aren't being routed to spam or junk folders.

3. Alternative confirmation method: Instead of waiting for the confirmation email, you can manually confirm the subscription using the AWS CLI or SDK with the `confirm-subscription` command. This bypasses the need for the confirmation email.

4. Try a different AWS region: Some users have reported issues with SNS confirmation emails from specific regions. If you're using eu-west-2 (London) region, for example, try creating the subscription in a different region like eu-central-1 or us-east-1.

5. Check for automatic unsubscription: Some spam filters might automatically cancel subscriptions. You can configure your SNS topic to prevent automatic unsubscribes.

6. Request confirmation again: In the AWS Management Console, select the subscription and choose "Request confirmation" to attempt sending the confirmation email again.

If these steps don't resolve the issue, you may need to contact AWS Support for further investigation, as there might be account-specific issues they need to address.  
**Sources**  
[SNS Subscription Confirmation Email not received | AWS re:Post](https://repost.aws/questions/QUcCTjE7L6QXif2svHexVn-Q/sns-subscription-confirmation-email-not-received)  
[No confirmation email from AWS SNS in London area | AWS re:Post](https://repost.aws/questions/QUAk7efWCxQWagHFpF072klA/no-confirmation-email-from-aws-sns-in-london-area)  
[SNS Email Subscription Automatically Deactivated After Confirmation | AWS re:Post](https://repost.aws/questions/QUWMD-hLHoSTmdwMN69k_ahQ/sns-email-subscription-automatically-deactivated-after-confirmation)  
[Use ConfirmSubscription with an AWS SDK or CLI - Amazon Simple Notification Service](https://docs.aws.amazon.com/sns/latest/dg/example_sns_ConfirmSubscription_section.html)

Not receiving SNS Topic Subscription e-mails on Microsoft 365 (outlook)

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