421 4.7.0 [TSS04] Messages from "pubilc IP" temporarily deferred due to user complaints - 4

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  Hi,

  What is the content type of the outbound message? HTML, plain text or rich text? 
  Is there any large size attachment file? And what is the file type?

  Run the following command to ensure the content type and formatting of the outbound message:

  Get-RemoteDomain | fl ContentType

  
  From the error message, it indicates Yahoo is seeing unusual traffic from your IP address and/or that emails from your mail server are generating complaints from Yahoo Mail users. 

  Here are the recommendations from Yahoo Help Community forums:

  • The error is temporary. We encourage you to retry sending emails 4 hours after encountering the error.
  • If you're not the administrator of the mail server in question, we suggest you contact the administrator directly to discuss the error.
  • If you're an administrator of message content and mailing policy and you've deployed significant changes or you've received this error for more than 48 hours, we ask that you review outgoing messages for objectionable content or practices.
  • See our recommended guidelines for bulk mail senders and postmasters and note we don't disclose further information about our filtering practices.

  Note: Microsoft is providing this information as a convenience to you. The sites are not controlled by Microsoft. Microsoft cannot make any representations regarding the quality, safety, or suitability of any software or information found there. Please make sure that you completely understand the risk before retrieving any suggestions from the above link.

  Regards,
  

  Manu Meng

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  • Proposed as answer by Manu Meng Tuesday, December 11, 2018 9:36 AM

  Monday, December 10, 2018 6:31 AM
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  Just checking in to see if above information was helpful. Please let us know if you would like further assistance.

  Regards, 

  Manu Meng

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  Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

  

  Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

  • Proposed as answer by Manu Meng Tuesday, December 18, 2018 9:56 AM

  Thursday, December 13, 2018 10:40 AM