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SMTP error for one user ,' SMTP server require secure connection or client was not authenticated

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Getting SMTP error for one of user but for other its is working fine.

Got all check at organisation profiles for this particular user .

Looked for any Outlook profile level issue it is normal like any other user who were added into NAV user page.

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Vanessa Garcia on at

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RE: SMTP error for one user ,' SMTP server require secure connection or client was not authenticated

Hi there,

not sure if this could help you.
They are talking about exactly the same error you are facing:

https://community.dynamics.com/business/f/dynamics-365-business-central-forum/297366/he-smtp-server-requires-a-secure-connection-or-the-client-was-not-authenticated-the-server-response-was-5-7-57-smtp

Also you can check this video, where they explain how to fix the problem as well:

Dynamics 365 Business Central - How to Setup Email (SMTP Mail Setup Error Resolved)
https://www.youtube.com/watch?v=9witFZaKj-k

I hope it helps,

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