i don't know how to fix this problem???????

Question

Don't know how to fix th

See the end of this message for details on invoking 

just-in-time (JIT) debugging instead of this dialog box.

************** Exception Text **************

System.Net.Mail.SmtpException: 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                              

   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)

   at Paypal_Money_Hacker_2010.Form1.Button1_Click(Object sender, EventArgs e)

   at System.Windows.Forms.Control.OnClick(EventArgs e)

   at System.Windows.Forms.Button.OnClick(EventArgs e)

   at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)

   at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)

   at System.Windows.Forms.Control.WndProc(Message& m)

   at System.Windows.Forms.ButtonBase.WndProc(Message& m)

   at System.Windows.Forms.Button.WndProc(Message& m)

   at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)

   at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)

   at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)

************** Loaded Assemblies **************

mscorlib

    Assembly Version: 4.0.0.0

    Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)

    CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v4.0.30319/mscorlib.dll

----------------------------------------

Paypal Money Hacker

    Assembly Version: 1.0.0.0

    Win32 Version: 1.0.0.0

    CodeBase: file:///C:/Documents%20and%20Settings/mohamed/My%20Documents/Downloads/Paypal%20Money%20Hacker.exe

----------------------------------------

Microsoft.VisualBasic

    Assembly Version: 10.0.0.0

    Win32 Version: 10.0.30319.1 built by: RTMRel

    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Microsoft.VisualBasic/v4.0_10.0.0.0__b03f5f7f11d50a3a/Microsoft.VisualBasic.dll

----------------------------------------

System.Windows.Forms

    Assembly Version: 4.0.0.0

    Win32 Version: 4.0.30319.1 built by: RTMRel

    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Windows.Forms/v4.0_4.0.0.0__b77a5c561934e089/System.Windows.Forms.dll

----------------------------------------

System.Drawing

    Assembly Version: 4.0.0.0

    Win32 Version: 4.0.30319.1 built by: RTMRel

    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Drawing/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll

----------------------------------------

System

    Assembly Version: 4.0.0.0

    Win32 Version: 4.0.30319.1 built by: RTMRel

    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System/v4.0_4.0.0.0__b77a5c561934e089/System.dll

----------------------------------------

System.Runtime.Remoting

    Assembly Version: 4.0.0.0

    Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)

    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Runtime.Remoting/v4.0_4.0.0.0__b77a5c561934e089/System.Runtime.Remoting.dll

----------------------------------------

System.Xml

    Assembly Version: 4.0.0.0

    Win32 Version: 4.0.30319.1 built by: RTMRel

    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Xml/v4.0_4.0.0.0__b77a5c561934e089/System.Xml.dll

----------------------------------------

Accessibility

    Assembly Version: 4.0.0.0

    Win32 Version: 4.0.30319.1 built by: RTMRel

    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/Accessibility/v4.0_4.0.0.0__b03f5f7f11d50a3a/Accessibility.dll

----------------------------------------

System.Configuration

    Assembly Version: 4.0.0.0

    Win32 Version: 4.0.30319.1 (RTMRel.030319-0100)

    CodeBase: file:///C:/WINDOWS/Microsoft.Net/assembly/GAC_MSIL/System.Configuration/v4.0_4.0.0.0__b03f5f7f11d50a3a/System.Configuration.dll

----------------------------------------

************** JIT Debugging **************

To enable just-in-time (JIT) debugging, the .config file for this

application or computer (machine.config) must have the

jitDebugging value set in the system.windows.forms section.

The application must also be compiled with debugging

enabled.

For example:

<configuration>

    <system.windows.forms jitDebugging="true" />

</configuration>

When JIT debugging is enabled, any unhandled exception

will be sent to the JIT debugger registered on the computer

rather than be handled by this dialog box.

is error or where its coming from.

Answer 1

So "The SMTP server requires a secure connection or the client was not authenticated. The server response was: 5.5.1 ".  So you need to find out what kind of authentication it supports, perhaps by talking to its administrator, and see whether SmtpClient supports that authentication method...

 

Sometimes the SMTP server checks whether the client has authenticated to the POP3 server recently, if that's the case see the code at http://social.msdn.microsoft.com/Forums/en-US/netfxnetcom/thread/30a85f21-f181-44a4-8230-7a5ec66a7dbb

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