Stop receiving from one doamin


  • Hello,

    Two days ago, I complained a vendor that he could not send e-mail to me, before I received messages from him without any problem this problem occur suddenly.

    please check the Logs and NDR to advise me to solve this issue:


    ---------51 4.7.0 Timeout waiting for client input


            Could not deliver message to the following recipient(s):

    Failed Recipient:
    Reason: Remote host said: 601 Attempted to send the message to the following


    Wednesday, February 17, 2016 8:16 AM

All replies

  • Sorry i typed log number by mistake, the correct one is"451 4.7.0 "


    Wednesday, February 17, 2016 8:19 AM
  • any update?

    Wednesday, February 17, 2016 8:29 PM
  • Hi,

    Recently, have you changed any configuration of exchange server?

    Try to configure protocol logging on receive connector, then send test message to check the SMTP conversation.

    And try to do message tracking on this test message. If this message has been delivered to your exchange server, then it might be sender side problem.

    Best Regards.

    Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact

    TechNet Community Support

    Thursday, February 18, 2016 9:17 AM
  • Thanks for reply,

    i did not change any thing in exchange, this suddenly happen.

    i am able to receive emails form many sender except this sender.he send me email in my Gmail account i have received. 

    i found below warning in logs in my server:

    "Inbound authentication failed with error LogonDenied for Receive connector Client. The authentication mechanism   is Ntlm. The source IP address of the client who tried to authenticate to Microsoft Exchange is [xx.xx.53.214]"

    Also in smtp receive logs:

    "535 5.7.3 Authentication unsuccessful"


    Thursday, February 18, 2016 2:17 PM
  • any suggestion ?

    Friday, February 19, 2016 2:12 PM