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Small and medium business | Business Central, N...
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SMTP error

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I'm trying to setup an email account in Business Central Online (latest version) to send emails as SMTP.
 
The email account is setup as a Specific User with Basic Authentication, using the "Apply Office 365 Server Settings" settings.
 
This is the error on the email outbox: (I've checked and the account and password are correct)

 
On the Microsoft Entra admin center, the tenant has “Security Defaults” enabled.
On the Microsoft 365 admin center, the specific email account has SMTP enabled.
The specific email account does not have MFA enabled.

The account can send emails directly from outlook.
This account is not a shared mailbox, but an individual account.

On Microsoft Entra admin center, on the login session log, the error displayed is the following: "Access has been blocked by security defaults.".
Is the override for the "Security Defaults" on the individual email account not working anymore?
Any help is appreciated.
I have the same question (0)
  • Suggested answer
    YUN ZHU Profile Picture
    90,130 Super User 2025 Season 2 on at
    SMTP error
    Hi, "SMTP error 535" is an authentication problem. Hope the following can give you some hints.
     
    Thanks.
    ZHU
  • Suggested answer
    Jun Wang Profile Picture
    8,152 Super User 2025 Season 2 on at
    SMTP error
  • Suggested answer
    Gerardo Rentería García Profile Picture
    22,566 Most Valuable Professional on at

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