Password changed automatically

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Posted on by YN-06081024-0

Hello Guys!

I faced very strange case. I tried to add a valid email account into Microsoft Dynamics 365 Business Central. Yesterday everything worked great. Today I received the error: "The email was not sent because of the following error: "The SMTP server rejected the authentication request, as the authentication data is incorrect. Verify that your Username and Password are correct and that the SMTP server supports the specified authentication type (Basic). SMTP error code: 535."

I was wondering how it happened because I didn't change my pass. I changed it. And now what I have. I tried to add my pass:

And if I tried to save this pass, I do not see 14 symbols (my pass), I see - 10 symbols:

And for sure I received the error: "The email was not sent because of the following error: "The SMTP server rejected the authentication request, as the authentication data is incorrect. Verify that your Username and Password are correct and that the SMTP server supports the specified authentication type (Basic). SMTP error code: 535."

Please help me! Because I can not understand what is going on.

Thanks!

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Dynamics 365 Business Central

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YUN ZHU 89,839 Super User 2025 Season 2 on at

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Password changed automatically

Very strange, I have never encountered this problem.
You can open the change log function to see when and who modified it. I think it is more likely to be human error.

Thanks

ZHU

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YN-06081024-0 19 on at

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Password changed automatically

Guys, I do not have a 2-step verification. A password and email are 100% correct. But I receive this error.

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Khushbu Rajvi. 18,797 Super User 2025 Season 2 on at

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Password changed automatically

Please create new App Password for your email account and then apply that password and check it.

Below link will help you to create app password.

https://support.microsoft.com/en-us/account-billing/manage-app-passwords-for-two-step-verification-d6dc8c6d-4bf7-4851-ad95-6d07799387e9#create-and-delete-app-passwords-from-the-additional-security-verification-page

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Gerardo Rentería Ga... 22,524 Most Valuable Professional on at

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Password changed automatically

Hi

I hope this can help you:

The SMTP error code 535 indicates an authentication issue during email sending (dynamics.com)

Solved: SMTP Email sending using Multi-Tenant Environment (dynamics.com)

Best

GR

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