535: 5.7.3 Authentication unsuccessful

Anonymous
2020-04-16T10:47:36+00:00

Hello,

I have an issue when using an O365 account and sending emails from an application.

The application has been suitable to use tls/starttls, port 587, ect.

When entering an email account and password, the following message occurs:

"535: 5.7.3 Authentication unsuccessful"

I would like to understand, what are the mininal features of an O365 account so that it can be used from another application.

I have performed different tests, which allow me to indicate that the account is Ok.

Thank you.

Microsoft 365 and Office | Subscription, account, billing | For home | Windows

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  1. Anonymous
    2021-01-24T02:45:31+00:00

    a mi me ocurre lo mismo realice el cambio de contraseña y ya me funciono, también se debe tener en cuenta en office 365 si pepito@algo va a enviar un correo debe autenticarse como pepito@algo

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  2. Anonymous
    2020-12-23T19:07:21+00:00

    Jarrid, this worked perfect, thank you so much.  GoDaddy was worthless.  Do I need to set the Execution Policy back to the default?  It gave me a warning when I set it to RemoteSigned.

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  3. Anonymous
    2020-12-10T22:32:56+00:00

    I think it may mean that the account you've entered the credentials for doesn't have full administrator permissions to change the setting. 

    I encountered those PowerShell errors and you are quite correct. I realized after reading this that I'd been authenticating using the account whose properties I was checking, instead of as an Exchange administrator.

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  4. Anonymous
    2020-11-19T15:02:54+00:00

    I'm not positive, but I think it may mean that the account you've entered the credentials for doesn't have full administrator permissions to change the setting.   You can always authenticate as the main admin account and then change other users.

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  5. Anonymous
    2020-11-19T11:37:58+00:00

    Many thanks for your instructions unfortunately i ran into a hickup

    I tried the same solution but I end up with:

    PS C:\WINDOWS\system32> Set-CASMailbox -Identity <******@domain.com> -SmtpClientAuthenticationDisabled  $false 

    A parameter cannot be found that matches parameter name 'SmtpClientAuthenticationDisabled'. 

    • CategoryInfo          : InvalidArgument: (:) [Set-CASMailbox], ParameterBindingException
    • FullyQualifiedErrorId : NamedParameterNotFound,Set-CASMailbox
    • PSComputerName        : outlook.office365.com  

    Any idea what the problem would be?

    Many thanks in advance.

    Kr,

    Tommy

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