When someone sends me and email, they are getting an email back saying delivery has failed, however I receive the email.

Hi Sarah Bothman, I know this is confusing you’re getting the email yet the sender thinks it failed. It creates unnecessary stress and miscommunication so you’re absolutely right to dig deeper instead of ignoring it.

To fix this issue ask the sender for the full bounce message to check the SMTP error code and which recipient failed, then whitelist the sender if their emails land in Junk, verify that your mailbox isn’t forwarding to an invalid address run a message trace if you’re on Microsoft 365 to see if a connector rejected part of the message confirm SPF/DKIM/DMARC settings if the NDR mentions authentication and if the email was sent to a group have the sender verify all recipient addresses.

When you look at the NDR details does it list your address as the failed recipient or another address in the same email? That will tell us if the problem is with your mailbox or someone else in the thread.

Best regards

Lucky Charm

When someone sends you an email and they receive a delivery failure notification (also known as a non-delivery report or NDR), but you still receive the email, it could be due to several reasons:

1. Spam Detection: The email might be flagged as spam by the recipient's email system, leading to a failure notification being sent back to the sender.
2. Quarantine Rules: The email could be sent to quarantine due to specific rules set by the email service, which may cause the sender to receive a failure notification.
3. Email Filtering: The email might be filtered or redirected by a connector or rule, resulting in a delivery failure for the sender even though you receive it.
4. Junk Folder: If the email ends up in your junk folder, it may trigger a notification to the sender indicating that the email was not delivered successfully.

To troubleshoot this issue, you can check the settings in your email account, and ensure that the sender's email address is whitelisted or not blocked. Additionally, reviewing the NDR message for specific error codes can provide more insight into the delivery issue.

References:

• Email non-delivery reports and SMTP errors in Exchange Online
• Message Trace FAQ in Exchange Online

This is likely happening because spammers are spoofing your email address, sending messages with your address as the sender but the actual email is going to someone else and failing. You are receiving the delivery failure notification for emails that you did not send. To fix this, you should report the spoofed emails as spam and add your email address to your safe senders list, although the spoofing will likely continue