smtp error

Irin Sultana 371 Reputation points
2022-07-11T21:14:36.687+00:00

Hi,

I am getting this error message in my server.One of my company software is not able to send email through smtp. All user getting this error message. Please help me to solve this problem.

Thank You!
Irin Sultana!

Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
12,113 questions
Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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Accepted answer
  1. Aholic Liang-MSFT 13,741 Reputation points Microsoft Vendor
    2022-07-13T01:09:05.557+00:00

    Hi @Irin Sultana ,

    Thank You for hiding information. I found the solution of that. It was TLS issue. I solved it.

    Great to know that you've already thought of a solution and really appreciate it for your sharing!
    By the way, since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others.". and according to the scenario introduced here: Answering your own questions on Microsoft Q&A, I would make a brief summary of this thread:

    [smtp error]

    Issue Symptom:
    I am getting this error message in my server.One of my company software is not able to send email through smtp.

    Root cause:
    I found the solution of that. It was TLS issue. I solved it.

    You could click the "Accept Answer" button for this summary to close this thread, and this can make it easier for other community member's to see the useful information when reading this thread. Thanks!

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  1. Aholic Liang-MSFT 13,741 Reputation points Microsoft Vendor
    2022-07-12T04:06:32.503+00:00

    Hi @Irin Sultana ,
    Considering that it's a public forum, I have covered the personal information in your post involved for privacy concern.

    ----------

    I wonder if you created a dedicated Receive connector to specify the network hosts that are allowed to anonymously relay messages?
    If not ,please refer to the step in the following link to create the dedicated receive connector for anonymous relay.
    And add the IP address that can use this connector to anonymous relay into the Remote network settings.
    Allow anonymous relay on Exchange servers | Microsoft Learn
    Then use third-party software testing to send an email to see if there are any changes.

    If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

  2. Amit Singh 4,846 Reputation points
    2022-07-12T11:13:25.867+00:00

    Please also make sure you have checked these settings in your tenant: Error: Authentication unsuccessful.

    Azure Security Defaults may cause the issue to be enabled (by default) in your tenant, and you need to disable it in Azure AD protocol.
    There is also a link with the same issue for your reference: 535 5.7.139 Authentication unsuccessful

    Also, add -credential (get-credential) to pass the sender's credentials to the Office 365 server.

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