The SMTP server requires a secure connection or the client was not authenticated

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I am getting this exception while sending mail can anybody help me.

"The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 Authentication Required. Learn more at" Learn more at
at System.Net.Mail.MailCommand.CheckResponse(SmtpStatusCode statusCode, String response)
at System.Net.Mail.MailCommand.Send(SmtpConnection conn, Byte[] command, String from)
at System.Net.Mail.SmtpTransport.SendMail(MailAddress sender, MailAddressCollection recipients, String deliveryNotify, SmtpFailedRecipientException& exception)
at System.Net.Mail.SmtpClient.Send(MailMessage message)"

Posted 8-Jul-13 19:33pm

Alka_26th

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_Damian S_ · Answer 1 · 2013-07-08T19:53:00

You have attempted to send an smtp email through an smtp server that requires authentication.

Either adjust your smtp server settings so that anonymous email sending is allowed (NOT A GOOD IDEA), swap to a public smtp server, or provide a user and password that does have rights to send via your SMTP server.

Thanks7872 · Answer 2 · 2013-07-08T19:56:00

Solution 2

Read this link carefuly

Send Email with Authentication using ASP.NET and C#.NET[^]

Regards.. :laugh:

Posted 8-Jul-13 19:56pm

Thanks7872