Here are some steps that you can try to fix the problem yourself. Additionally, to help prevent spammers from impersonating you or others in your organization, ask your email admin to read this topic: Set up SPF to help prevent spoofing.

The resulting bounce message that you get is called backscatter, and you can safely ignore or delete the bounce message.īackscatter itself is harmless, but if you're getting much of it, it's possible that your computer or device is infected with spam-sending malware. It's annoying, but if this NDR is backscatter, your account hasn't been compromised.Ī spammer sent a message to a non-existent recipient, and they falsified the From address so it appears the message was sent by your email address. This type of useless NDR is called backscatter. But what if the message was sent by a spammer who falsified the From address so it appears the message came from your email address? The resulting NDR that you'll receive is useless because it creates the false impression that you did something wrong. Typically, if a message can't be delivered, the recipient's email system will use the sender's email address in the From field to notify the sender in an NDR like this one. How do I fix it? section in this article. The recipient's email address doesn't exist or couldn't be found.You received this NDR with error code 5.1.10 for one of the following reasons: If you get a non-delivery report (NDR), also called a bounce message, for error code 550 5.1.10, this article can help you fix the problem and get your message sent. Problems sending and receiving email messages can be frustrating. Mail flow rules are now available in the new Exchange admin center.

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