Hello :)
We have a setup where a custom Email is used for recruiting and it worked fine for some time, but since about a week ago it doesn’t anymore. Looking through the error message it states that the SMTP Authentication is not working. I’ve checked the help article for this an have gone through every step to make sure all the requirements are fulfilled.
Things I’ve done include:
-Turning off 2FA
-Setting a new password for the user
-Setting up an App password for authentication
-Making sure that SMTP Auth is activated in M365 for this account
-Checked all SMTP settings in Personio
Unfortunately every test fails and comes back with the same error message:
Failed to authenticate on SMTP server with username "jobs@contoso.com" using the following authenticators: "LOGIN", "XOAUTH2". Authenticator "LOGIN" returned "Expected response code "235" but got code "535", with message "535 5.7.139 Authentication unsuccessful, user is locked by your organization's security defaults policy. Contact your administrator. [FR4P281CA0258.DEUP281.PROD.OUTLOOK.COM 2024-04-09T10:33:16.563Z 08DC5823B49B5080]".". Authenticator "XOAUTH2" returned "Expected response code "235" but got code "535", with message "535 5.7.3 Authentication unsuccessful [FR4P281CA0258.DEUP281.PROD.OUTLOOK.COM 2024-04-09T10:33:26.866Z 08DC5823B49B5080]".".
Judging from the error message the default security policy is causing this error, as Microsoft disabled the legacy auths a while ago, but the option to enable SMTP Auth for selected mailboxes is still shown and enabled. Do I really have to disable the default security policy for this to work?
Would be very happy for any tip or insight about this topic that you might have!
Best regards,
Leo
Best answer by International Support Team
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