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Dynamics 365 Community / Forums / Business Central forum / he SMTP server require...
Business Central forum

he SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP;

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Posted on by KC Lai 335

Hi ,

I encountered the following error when testing on SMTP after applying O365 Server Settings.

i have provided my email and passwords. 

The mail system returned the following error: "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.57 SMTP; Client was not authenticated to send anonymous mail during MAIL FROM [SG2PR0302CA0009.apcprd03.prod.outlook.com]".

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  • Suggested answer
    Stefano Demiliani Profile Picture
    Stefano Demiliani 37,166 Most Valuable Professional on at

    It seems that some settings are not correct.

  • ictnetworks Profile Picture
    ictnetworks 10 on at

    We have the same problem, and it was after enabling MFA.

    Any Suggestions would be greatly appreciated.

  • santhanak Profile Picture
    santhanak 360 on at

    I have a same issue. please let me know if you figure out.

    In my case, BC Cloud is into different domain than O365 domain. now i could not able to configure SMTP at all. does any one has any suggestion how to configure SMTP?

  • ictnetworks Profile Picture
    ictnetworks 10 on at

    Did some testing, and found out that " Baseline Policy: Block Legacy Authentication ", is blocking connection from BC to Exchange Online, and also Connection for Dynamics CRM in my case.

    Trying to figure out how to bypass this policy for specific users.

  • -Chris- Profile Picture
    -Chris- 45 on at

    any News on this, have the same Problem, with Baseline Policy: Block Legacy Authentication … no mail delivery is possible

  • Suggested answer
    -Chris- Profile Picture
    -Chris- 45 on at

    so just got of the phone with the Microsoft support.

    We created the Conditional Access policies from Scratch, on the block legacy, it will be possible to exclude your Mailbox account for Business central !

    Check this link on the Bottom of the page for further instructions:

    docs.microsoft.com/.../concept-conditional-access-security-defaults

  • Chris Bulson Profile Picture
    Chris Bulson Microsoft Employee on at

    The error means it cannot connect.  There are 3 main reasons this will occur.
    - The user doesn't actually have a mailbox in Office 365
    - You are typing in the wrong username or password

    The other reason, as others have pointed out is that MFA is enabled in some form.  If the user must have MFA enabled then you will have to utilize an App Password to get the connection setup.

    https://community.dynamics.com/business/b/d365businesscentral/posts/multi-factor-authentication-and-dynamics-365-business-central

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