how fix we couldn't deliver your message in outlook 365 error code 9912

Question

Error in Outlook 365

We couldn't deliver your message.

__Original message details__Created date: 05/09/2024 07:35:25Sender address: xxxx@orange.frRecipient addresses: ******@gmail.com; ....

MessageDeliveryFailedException: Could not deliver the message [len=70, data=0000000041FEA83B9A11F6468D2272512714055E07001D77208834771F4ABAA07B035B9C318200000000010F00001D77208834771F4ABAA07B035B9C318200003A03A32E0000] sent at 05/09/2024 07:35:33.
Failure code: 9932

Answer 1

Based on the provided context, error code 9912 is not listed as a known error code in Microsoft 365 or Outlook. Therefore, it is not possible to provide a specific solution to this error code. However, there are some general troubleshooting steps that can be taken to resolve email delivery issues in Outlook 365, such as checking the recipient's email address for accuracy, verifying that the address book in Outlook is up to date, and ensuring that the sending email system is authenticated with the receiving email system. If the issue persists, it may be necessary to contact your network administrator or Microsoft support for further assistance.

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References:

• This message could not be sent NDR when an approved user sends mail in Microsoft 365
• Mail flow intelligence in EOP
• Email non-delivery reports and SMTP errors in Exchange Online

Answer 2

Hi @Terry Ryan

Welcome to our forum!

For better research, please provide more details about this case:

Please confirm if you're able to send mail when using Outlook on the web?

What account are you using in Outlook? (IMAP/Exchange/POP)

What's the version of your Outlook? (File > Office Account > About Outlook). Please make sure you have upgraded your Outlook to the latest version.

Here are a few steps you can try to resolve the issue:

1. Repair Your Account: Go to Account Settings > Account Settings, select your account, and click on Repair.
2. Delete and Re-Add Account: You might need to remove your email account from Outlook and add it again using the manual setup option.
3. Download and run the Microsoft Support and Recovery Assistant.

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