error '80040211': Problem with Godaddy server while sending email

I am getting error '80040211' when trying to send an email to a rediffmail.com id using a godaddy server. So far the problem is only with rediffmail.com ids, but this problem may be there for some other email addresses as well I guess. I have tested several other ids from yahoo, gmail etc. and all are delivered without any problem.

The code that I am using is copied below:

<%
sendUrl="http://schemas.microsoft.com/cdo/configuration/sendusing"
smtpUrl="http://schemas.microsoft.com/cdo/configuration/smtpserver"


' Set the mail server configuration
Set objConfig=CreateObject("CDO.Configuration")
objConfig.Fields.Item(sendUrl)=2 ' cdoSendUsingPort
objConfig.Fields.Item(smtpUrl)="relay-hosting.secureserver.net"
objConfig.Fields.Update


' Create and send the mail
Set objMail=CreateObject("CDO.Message")
' Use the config object created above
Set objMail.Configuration=objConfig



emailbody = "Whatever it is"






objMail.From="xxxx@mydomain.com"






objMail.To="myemail@rediffmail.com"
objMail.Subject="Testing my rediffmail problem "
objMail.HTMLBody = emailbody
objMail.fields.update
objMail.Send
response.write email_id & "<br>"




%>

The following text is shown when running my script

error '80040211'

/email_godaddy.asp, line 21

Please provide any hints to sort out the issue.

Thank you.

 

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Net.Mail;
using System.Net;


public partial class query : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{


}
protected void Button1_Click(object sender, EventArgs e)
{
SmtpClient m = new SmtpClient("mail.domainname.com");

MailAddress to = new MailAddress("to@domain.com");
MailAddress from = new MailAddress("from@domain.com");
MailMessage mm = new MailMessage(from, to);
mm.Subject = "your subject ";

mm.IsBodyHtml = true;
m.Credentials = new NetworkCredential("from@domain.com", "password");
mm.Body = " ";




try
{
m.Send(mm);



}
catch (Exception ex)
{

}
}
}