// ExStart:SetSpecificIpAddress
 public static void Run()
 {
     using (SmtpClient client = new SmtpClient("smtp.gmail.com", 587, "*****@*****.**", "your.Password", SecurityOptions.Auto))
     {
         // set callback
         client.BindIPEndPoint += BindIPEndPointCallback;
         client.Noop();
     }
 }
 public static void Run()
 {
     using (SmtpClient client = new SmtpClient("smtp.gmail.com", 587, "*****@*****.**", "your.Password", SecurityOptions.Auto))
     {
         // set callback
         client.BindIPEndPoint += BindIPEndPointCallback;
         client.Noop();
     }
 }