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I am using .net version 3.5 for sending mails though my web application

I get the following error:

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

What could be causing this?

Curtis Inderwiesche
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kumar
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3 Answers3

2

Source from here http://www.systemnetmail.com/faq/4.2.aspx

//create the mail message
MailMessage mail = new MailMessage();

//set the addresses
mail.From = new MailAddress("[email protected]");
mail.To.Add("[email protected]");

//set the content
mail.Subject = "This is an email";
mail.Body = "this is the body content of the email.";

//send the message
SmtpClient smtp = new SmtpClient("127.0.0.1");

//to authenticate we set the username and password properites on the SmtpClient
smtp.Credentials = new NetworkCredential("username", "secret"); 
smtp.Send(mail);

EDIT: This error means what it's written: smtp server needs authentication information (username and password). So, you need set SmtpClient.Credentials.

VikciaR
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0

Try:

smtpclient.EnableSsl = true;
leppie
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  • iths giving this error now : The remote certificate is invalid according to the validation procedure. – kumar May 20 '11 at 11:10
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    @kumar check this out [a hack](http://stackoverflow.com/questions/777607/the-remote-certificate-is-invalid-according-to-the-validation-procedure-plea) – V4Vendetta May 20 '11 at 11:36
0

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

so you need to authenticate by adding credentials

smtpClient.Credentials = new NetworkCredential("username", "password");
Yaur
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