Warning: could not send message for past 2 hours

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  Hi all

  I am trying to send messages from my exchange server to yahoo mail but I get this error:

  **      THIS IS A WARNING MESSAGE ONLY      **

      **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **

      **********************************************

   

  The original message was received at Thu, 21 May 2020 13:52:03 +0200

  from:

  <xxx@xxx.net.eg>

   

     ----- Transcript of session follows ----- ... while talking to

  mta7.am0.yahoodns.net.:

  >>> MAIL From:<xxx@xxx.net.eg> SIZE=3313

  <<< 421 4.7.0 [TSS04] Messages from 163.121.6.6 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html

  ... while talking to mta6.am0.yahoodns.net.:

  >>> MAIL From:<amrwahdan@idsc.net.eg> SIZE=3313

  <<< 421 4.7.0 [TSS04] Messages from 163.121.6.6 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html

  ... while talking to mta5.am0.yahoodns.net.:

  >>> MAIL From:<xxx@xxx.net.eg> SIZE=3313

  <<< 421 4.7.0 [TSS04] Messages from 163.121.6.6 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html

  <amr_waw@yahoo.com>... Deferred: 421 4.7.0 [TSS04] Messages from 163.121.6.6 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html

  Warning: message still undelivered after 2 hours Will keep trying until message is 3 days old

  Note: I can send messages to office 365, Gmail, Hotmail normally

  It tells you right there what the problem is:

  <<< 421 4.7.0 [TSS04] Messages from 163.121.6.6 temporarily deferred due to user complaints - 4.16.55.1; see https://help.yahoo.com/kb/postmaster/SLN3434.html

  • Proposed as answer by Burak VAROL Thursday, May 21, 2020 8:57 PM

  Thursday, May 21, 2020 6:55 PM
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  Hi MEMIDA,

  Based on the information your provided and error. Your mailbox only couldn't send mail to Yahoo, this doesn't seem to be a problem with Exchange.

  I find an article about this error, there are several suggestions mentioned in it, you could try:

  1. The error is temporary, so please retry sending emails 4 hours after encountering the error.

  2. If you're not the administrator of the mail server in question, please contact the administrator directly to discuss the error.

  3. 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, please review outgoing messages for abnormal information or unsafe information.

  For more information:Error: "421 4.7.0 [XXX] Messages from x.x.x.x temporarily deferred due to user complaints - 4.16.55.1" when sending email to Yahoo and Bulk email industry standards and best practices.

  Please Note: Microsoft provides third-party contacts information to help you find technical support. These contacts information may change without notice. Microsoft does not guarantee the accuracy of this third-party contacts information.

  In additional, I suggest you go to Yahoo for help.
  

  Regards,
  

  Lucas Liu

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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.

  • Proposed as answer by Lucas_ LiuMicrosoft contingent staff Monday, May 25, 2020 12:59 AM

  Friday, May 22, 2020 3:09 AM
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  Hi HEMIDA，

  I am writing here to confirm with you how thing going now? If the above suggestion helps, please be free to mark it as an answer for helping more people.

  Thanks for your understanding.

  Regards,
  

  Lucas Liu

  ---

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

  • Proposed as answer by Lucas_ LiuMicrosoft contingent staff Friday, June 5, 2020 8:19 AM

  Wednesday, May 27, 2020 1:27 AM