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The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.7.1 Client was not authenticated March 27, 2018

Posted by juanpablo1manrique in SharePoint.
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I have the same problem,

I resolved using

SmtpClient smtpClient = new SmtpClient(smtpServer, 25);

I discovered that the transactions try to go by the por 854,

smtpServer:854

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