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: Temporary network or internet connection issues in the destination domain.Īggressive anti-spam settings in the destination domain that block legitimate senders (for example, all senders from any domain in Exchange Online). If you get this error only for messages that you sent to a specific domain (for example, only recipients in the domain), the problem is likely with that destination domain. 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. This section contains the steps that you can try to fix the problem yourself. Use the information in the NDR to help you decide how to fix the problem. Why did I get this bounce message?įor more information, see the Causes for error code 4.4.7 section later in this article. This article describes what you can do if you see error code 550 4.4.7 in a non-delivery report (also known as an NDR, bounce message, delivery status notification, or DSN). It's frustrating when you get an error after sending an email message. Mail flow rules are now available in the new Exchange admin center.
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