What Organization Policy an email to a ##########@txt.att.net Email address was rejected for

Scott Ward (MTM) 0 Reputation points
2024-11-11T21:34:37.3066667+00:00

Good afternoon!

I am helping a colleague who sent an email to his phone number (email to text) via the ATT Text Relay by adding the following to his phone number: @txt.att.net. He recently was no longer able to do this and get's a bounceback saying that the message is rejected on a Microsoft Mail server due to an Organization Policy. I'd like to know what policy is blocking the message.

This used to be how he got alerts from a server he is using. It has stopped working.
The last bounceback he got says the following:

Error Details

Error: 550 5.7.1 TRANSPORT.RULES.RejectMessage; the message was rejected by organization policy

Message rejected by:

SN7PR13MB6101.namprd13.prod.outlook.com

It looks like a production Outlook Mail server has rejected the message and bounced it back.

Here is the rest of the bounceback:

|Original Message
Details| | -------- | |Original Message Details| |Created Date:11/11/2024 1:52:55 PM Created Date: 11/11/2024 1:52:55 PM Sender Address: Omitted for privacy Recipient Address: Omitted for Privacy . . . Subject: Error Test|

Thanks,
Scott

Microsoft 365
Microsoft 365
Formerly Office 365, is a line of subscription services offered by Microsoft which adds to and includes the Microsoft Office product line.
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A family of Microsoft email and calendar products.
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  1. ChristyZhang-MSFT 23,901 Reputation points Microsoft Vendor
    2024-11-12T06:19:26.3433333+00:00

    Hi @Scott Ward (MTM) ,

    Welcome to our forum!

    Based on my research on the error "550 5.7.1", i found that this error indicates a security setting in your organization or the recipient's organization is preventing your message from reaching the recipient. Please refer to this official article to troubleshooting: Fix NDR error "550 5.7.1" in Exchange Online.

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    Hope to help you!

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