Hi

i am getting the following error , i have added the authentication tag
also, but still it causing error , is there any other alternative
method to send mail

 Exception Details: System.Runtime.InteropServices.COMException: The
server rejected one or more recipient addresses. The server response
was: 503 This mail server requires authentication. Please check your
mail client settings.

<% @Import Namespace="System.Web.Mail" %>
<script language="vb" runat="server">

Sub btnSendFeedback_Click(sender as Object, e as EventArgs)

  'Create an instance of the MailMessage class
  Dim objMM as New MailMessage()

  'Set the properties - send the email to the person who filled out the
  'feedback form.
  objMM.To = "[EMAIL PROTECTED]"
  'objMM.From = txtEmail.Text
  objMM.From = "[EMAIL PROTECTED]"


  objMM.BodyFormat = MailFormat.Text


  objMM.Priority = MailPriority.Normal

  'Set the subject
  objMM.Subject = "Feedback"

  'Set the body
  objMM.Body = "message body"

   
objMM.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate";,
"1") 'basic authentication
   
objMM.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername";,
"iusername") 'set your username here
   
objMM.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword";,
"pwd") 'set your password here

   SmtpMail.SmtpServer = "mail.server.com"

  
  'Now, to send the message, use the Send method of the SmtpMail class
  SmtpMail.Send(objMM)


  panelSendEmail.Visible = false
  panelMailSent.Visible = true
End Sub

</script>

<html>
<body>
  <asp:panel id="panelSendEmail" runat="server">
    <form runat="server">
      <h2>We are interested in your feedback!  Please enter the following
      requested information below to send us your comments.</h2>

      <b>Your Name:</b>
      <asp:textbox id="txtName" runat="server" />
      <br>

      <b>Your Email Address:</b>
      <asp:textbox id="txtEmail" runat="server" />
      <p>

      <b>Your Message:</b><br>
      <asp:textbox id="txtMessage" TextMode="MultiLine"
                      Columns="40" Rows="10" runat="server" />
      <p>

      <asp:button runat="server" id="btnSendFeedback" Text="Send Feedback!"
                  OnClick="btnSendFeedback_Click" />
    </form>
  </asp:panel>


  <asp:panel id="panelMailSent" runat="server" Visible="False">
    An email has been sent to the email address you specified.  Thanks!
  </asp:panel>
</body>
</html>


 
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