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Details for error code 5.1.0
The NDR from Exchange Online for this specific error might contain some or all of the following information:
User information section: Address Rejected. A problem occurred during the delivery of this message to this email address.
Diagnostic information for administrators section: Recipient address How to Change Language on Google Chrome rejected: SPF Permanent Error.
Admins: Sign in and create a service request.
Admins: Call Support.
See also
Email non-delivery reports in Exchange Online
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Fix email delivery issues for error code 550 ..7 in Exchange Online
Article
12/30/2021
minutes to read
12 contributors
Importnt
Mail flow rules are now available in the new Exchange admin center. Try it now!
It's frustrating when you get an error after sending an email message. This article describes what you can do if you see error code 550 ..7 in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN).
Why did I get this bounce message?
For more information, see the Causes for error code ..7 section later in this article.
Use the information in the NDR to help you decide how to fix the problem.
Email user icon. I got this bounce message. How do I fix it? Email admin icon I'm an email admin. How do I fix this? Help symbol Causes for error code ..7
I got this bounce message. How do I fix it?
This section contains the steps that you can try to fix the problem yourself.
If the steps in this section don't fix the problem for you, contact your email admin and refer them to this article so they can try to resolve the issue for you.
If you get this error only for messages that you sent to a specific domain (for example, only recipients in the @fabrikam.com domain), the problem is likely with that destination domain. For example:
Temporary network or internet connection issues in the destination domain.
Aggressive anti-spam settings in the destination domain that block legitimate senders (for example, all senders from any domain in Exchange Online).
If you suspect a problem with the destination domain, notify the recipient (by phone, in person, etc.) with the information in the NDR so they can notify their email admins:
The name of the email mail server in the destination domain, and the error message that's returned by the email server.
The number of delivery attempts made that were made by the datacenter server in Exchange Online, and how long it tried to reach the remote server.
The email admins in the destination domain will need to investigate the issue. Possible solutions might include: