Error Message 4.4.7
for error code 4.4.7 in Office 365 Applies To: Outlook 2016, Outlook 2013, Office 365 Admin, Outlook 2010, Outlook 2007, Less Applies To: Outlook 2016 , Outlook 2013 , Office 365 Admin , Outlook 2010 , Outlook 2007 , More... Which version do I have? More... This topic can help you fix email problems that are associated with error code 550 4.4.7 if you see this in a non-delivery report (NDR). Mail flow problems can be frustrating, but we have solutions you can try in order to get your message sent. There can be several causes for dsn error code 4.4.7, so use the information in the NDR to decide how to fix the problem. For more details about the causes, see Causes for 4.4.7, later in this topic. I sent a message, what can I do to fix this? I'm the Admin, what can I do to fix this? Why did I get a non-delivery report? I sent a message and got error code 4.4.7 in an NDR. What can I do to fix this? Here are some procedures that you can try that might allow you to resend the message successfully. Message delivery from server-to-server can be complicated or require special access to settings, so most of these steps are designed for an Office 365 email administrator and not the average email sender. If the steps here don’t help, contact your email administrator and refer them to this information so they can try to resolve the issue for you. Problems in the destination domain If you get DSN error code 4.4.7 and have problems sending email to recipients in one domain only, the problem is likely with that destination domain. A domain is similar to an organization name or the name of an email provider and in an email address it shows up on the right-hand side of the at symbol (@). For example, in Harumi@contoso.com contoso.com is the domain name. Learn more about domains at What are domain names? Possible causes for domain issues include: 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 the problem is with the destination domain, let the administrators of that domain know. You need to provide the following information, which is all contained in the NDR: The name of the mail server in the destination domain, and the error message returned by the mail server. The number of delivery attempts made by your email server, an Exchange Online source server, and how long it tried to reach the remote server. The administrators in the destination domain will need to investigate what's happening. Possible solutions may include: Stop blocking messages from
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