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Using Office365 mail account as relay to send mails from an OVH VPS dedicated server - 5.7.139 Authentication unsuccessful, account locked

Nicolas MONTEIL 1 Reputation point
2022-02-21T10:26:09.92+00:00

Hello,
I am trying to use my Office365 mail account ******@pipolino.com (GoDaddy subscription) in order to send mails from a dedicated server OVH VPS.

I am using SMTP AUTH method to connect as described in the help (option 1).
Multi-authentification is not activated on the account.
SMTP authentification has been activated from GoDaddy admin console.

I tried through Postfix configuration and also manually via telnet openssl client, the connection is OK, server is responding BUT I've got always the same error:
"535 5.7.139 Authentication unsuccessful, account locked. Contact your administrator. [AM0PR02CA0155.eurprd02.prod.outlook.com]"

When I do the same manual test via telnet openssl client from my computer, the login is successful.

In the https://mysignins.microsoft.com/, I can see the attemp which is unsuccessful but not telling why.

Do you have any idea how to solve that?
Is my OVH server is somehow blacklisted somewhere?

Thank you for your help.

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