Compromised O365 account used for SMTP spam. Troubleshooting SMTP Mail Setup error '5.7.3 Authentication ... In summary, we announced we were postponing disabling Basic Auth for protocols in active use by your tenant until further notice, but that we would continue to disable Basic Auth for all protocols not being used. Via de Azure AD settings heb ik voor alle servers uit staan dat 2FA gebruikt moet worden. 5.7.139 Authentication unsuccessful error suddenly | WordPress.org You need to make sure your certificates for the connector contain your domain, or it will be treated as external email relaying. server returned 530 MustIssueStartTlsFirst exception" occurs Below is a snippet you can use to send email via this method. Authentication Error with Office 365 | WordPress.org Select the user, and in the flyout that appears, click Mail.
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