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Editorial Team
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Asked: 2026-05-11T18:23:30+00:00

I am trying to send email using Exchange 2007 from a console app using

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I am trying to send email using Exchange 2007 from a console app using the following code and I get this error message in the exception that gets thrown on the Send call.

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

MailMessage message = new MailMessage();
message.From = new MailAddress("from@example.com");
message.To.Add("to@domain.com");
message.Subject = "test";
SmtpClient smtp = new SmtpClient(ConfigurationUtil.SMTPServer);
smtp.Credentials = new System.Net.NetworkCredential("from@example.com", "password");
smtp.Send(message);

This worked on Exchange 2003.

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1 Answer

  1. Editorial Team

    This ended up being an Exchange 2007 issue and had nothing to do with code.

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