A non-delivery report (NDR) message

Question

Dear All,

We are using hybrid environment, I received the error message when user on office 365 try to send email to exchange server 2016 on-premise.

Status
Office 365 received the message that you specified, but couldn't deliver it to the recipient (user@keyman ) due to the following error:

Error: 550 5.6.0 M2MCVT.StorageError.Exception: ConversionFailedException - ConversionFailedException, The message content has become corrupted.; storage error in content conversion

A non-delivery report (NDR) message was sent to user@keyman . The NDR might provide more details about why the email message wasn't delivered and how to fix the issue.

How to fix it
Ask the sender (user@domian) to follow the instructions in the NDR to fix this issue. The NDR might also include specific information for email admins. If the sender is unable to fix the issue, ask them to forward you the NDR and then follow the guidance for email admins.

What's possible reason with non-delivery report (NVR)?

Answer 1

Hi @Suy Peang

Does the email you sent contain any attachment? Like Andy asked above, please provide more information about this situation for further troubleshooting.

If the issue occurs for all emails, you could also try using ExRCA tool to test outbound/inbound SMTP email as well: https://testconnectivity.microsoft.com/tests/o365

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