//create the mail message
        MailMessage mail = new MailMessage();
 
        //set the addresses
        mail.From = new MailAddress("no-reply@sarirgroup.ir"); //IMPORTANT: This must be same as your smtp authentication address.
        mail.To.Add("mogtaba_mortazavi@yahoo.com");
        
        //set the content
        mail.Subject = "This is an email";
        mail.Body = "This is from system.net.mail using C sharp with smtp authentication.";
        //send the message
         SmtpClient smtp = new SmtpClient("mail.sarirgroup.ir");
         
//IMPORANT:  Your smtp login email MUST be same as your FROM address.
         NetworkCredential Credentials = new NetworkCredential("no-reply@sarirgroup.ir", "**********");
         smtp.Credentials = Credentials;
       
         try
         {
             smtp.Send(mail);
             ViewBag.Message = "Send  OK ";
         }

         catch (Exception ex)
         {
             //Error, could not send the message

             ViewBag.Message = ex.Message;
         }

خطای مشاهده شده بصدینصورت می باشد :

آیا تنظیمات بیشتری در Web.config مورد نیاز است؟

لطفا راهنمایی بفرمایید.

با تشکر - مرتضوی