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550 5.7.64 TenantAttribution; Relay Access Denied SMTP.

Anonymous
2024-02-14T19:38:11+00:00

I relay email through Exchange Online Protection from your on-premises Internet Information Services (IIS) SMTP server. I have an inbound connector that's set to on-premises and has certificate validation enabled. In this scenario, mail isn't relayed through Exchange Online Protection. Additionally, you receive the following error message: 550 5.7.64 TenantAttribution; Relay Access Denied SMTP.

Public certificate is available and i have verified the Root CA as well but still This problem occurs if the on-premises server is not sending the required certificate chain during the Transport Layer Security (TLS) handshake to Exchange Online.

Windows for business | Windows Server | Devices and deployment | System management components

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  1. Anonymous
    2024-02-15T01:52:28+00:00

    Hi Anasmohdkhan,

    thank you for posting on the Microsoft Community Forums.

    Based on the description, I understand that your issue is related to Microsoft Exchange Online.

    Since there are no engineers dedicated to Microsoft Exchange Online in this forum. In order to be able to deal with your questions quickly and efficiently, I recommend that you repost your questions in the Q&A forum, where there will be a dedicated engineer to provide you with a professional and effective response.

    Here is a link to the Q&A forum: https://learn.microsoft.com/en-us/answers/questions/

    Have a nice day.

    Best regards,

    Lei

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