Exception message while sending an email

Question

Exception:

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

I am not using Defaultcredentials, so I set client.UseDefaultCredentials = false; Also, I provided valid email id and password, host name and port number; however, I am still getting the same Exception. How can I resolve this issue? Thanks in advance for any help.

public void SendCustomerForgotPassword(string mailTo, string forgotUserId, string forgotPassword) 
{ 
    string mailSubject = "", mailBody = "";
    mailSubject = ""; 
    StringBuilder sbMailBody = new StringBuilder(); 
    sbMailBody.AppendLine("Welcome to *****,"); 
    sbMailBody.AppendLine("\r"); 
    mailBody = sbMailBody.ToString(); 
    SetSmtpClient(mailTo, mailSubject, mailBody); 
}




    private void SetSmtpClient(string recipients, string subject, string body)
    {
        string EmailFrom = "here set an email id";
        string EmailFromPassword = "set password";

        System.Net.NetworkCredential credentials = new System.Net.NetworkCredential(EmailFrom, EmailFromPassword); 
        SmtpClient client = new SmtpClient(); 
        client.DeliveryMethod = SmtpDeliveryMethod.Network; 
        client.EnableSsl = true; 
        client.Host = "pod51018.outlook.com"; 
        client.Port = 587; 
        client.UseDefaultCredentials = false; 
        client.Credentials = credentials; 
        client.Send(EmailFrom, recipients, subject, body);
    }

@Manjusha please edit your question and put the formatted code there, rather than a comment. — KP.
– KP., Commented Oct 22, 2012 at 12:42
Make sure you change that password so people don't use your sever as a relay. You wouldn't want your server to become blacklisted. — Chris Andrews
– Chris Andrews, Commented Oct 22, 2012 at 12:46

Blachshma · Accepted Answer · 2012-10-22 13:17:05Z

0

Just like the message states, you're not authenticated.

In your code:

string EmailFrom = "";
string EmailFromPassword = "";

        System.Net.NetworkCredential credentials = new System.Net.NetworkCredential(EmailFrom, EmailFromPassword);

If this is your exact code - you're passing an empty username and password..

answered Oct 22, 2012 at 13:17

Blachshma

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8 Comments

Manjusha Over a year ago

No am sending my credentials emailid and password

Blachshma Over a year ago

@Manjusha - So in your code EmailFrom and EmailFromPassword have the correct username/password inside them?

Manjusha Over a year ago

@Blachshma - Previously it was worked now its showing that exception

Blachshma Over a year ago

Did you try switching to port 995 instead of 587?

Manjusha Over a year ago

@Blachshma- No i will try once

|

Ryan McDonough · Accepted Answer · 2012-10-22 13:18:18Z

0

You will need to check the following details are correct (as in the details shown on your Office 365 panel)

Host Name
E-Mail Address
Password

The code appears good (assuming your actually passing an address/password since it's a blank string in your code) so it's likely an issue in your settings.

answered Oct 22, 2012 at 13:18

Ryan McDonough

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