i have a web project that sending a mail is a necessary work
but i have an error
this is my page
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.Web.Mail;
using System.Net.Configuration;

public partial class mail : System.Web.UI.Page
{
   protected void Page_Load(object sender, EventArgs e)
   {
       string from = "farazedanesh@farazedanesh.org";
       string to = "miladhatam@gmail.com";
       string subject = "Hi!";
       string body = "How are you?";
       SmtpMail.SmtpServer = "mail.farazedanesh.org";

       SmtpMail.Send(from, to, subject, body);
  {
and web.config
<configuration>
 <system.net>
   <mailSettings>
     <smtp deliveryMethod="network">
       <network
         host="mail.farazedanesh.org"

         userName="farazedanesh@farazedanesh.org"
         password="xxxxx"
       />
     </smtp>
   </mailSettings>
 </system.net>
</configuration>

}my error

The server rejected one or more recipient addresses. The server
response was: 550 <miladhatam@gmail.com> No such user here