Error 550.5.7.162 OmeEncryptionAgent

Tom van den Berg 10 Reputation points

Hi there,

A lot of mails are not deliverd in our company with the error code:

Error: 550.5.7.162 OmeEncryptionAgent: Permanent Failure 550-5.7.162 Exception encountered: RmEXception.
Exception message: ETR encryption only applies to outging mail. Failurecode:UnknownFailure: Recoverable:False.

I already whitelist one of the external domains, but this did not solve the issue. and it looks like more and more mails are failing with this code.

Someone any idea what is going on.

Thanks in advanced.


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  1. Kael Yao-MSFT 37,676 Reputation points Microsoft Vendor

    Hi @Tom van den Bery,

    Recently there have been several similar issues.

    If possible please consider creating a service request in Microsoft 365 admin center>Support>Help & Support for help.

    Here is also a thread discussing this issue for your reference: Remote server returned '550-5.7.162 OmeEncryptionAgent

    (Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.)

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