Email sent through localhost but not sent when I try to send from my Server ... What to Do.. Please Help

public void SendMail()
   {
 
       Random rn = new Random();
       code = rn.Next(10, 100000);
       checkcode = code;
 
       // Gmail Address from where you send the mail
       var fromAddress = "its.manak@gmail.com";
       // any address where the email will be sending
       var toAddress = email.Text.ToString();
       //Password of your gmail address
       const string fromPassword = "itsmanak";
       // Passing the values and make a email formate to display
       string subject = "Verification code for lodging complaint".ToString();
       string body = "From: " + email.Text + "\n";
       body += "Subject: " + subject + "\n";
       body += "Your Code is: " + code.ToString() + "\n";
 
       // smtp settings
       var smtp = new System.Net.Mail.SmtpClient();
       {
           smtp.Host = "smtp.gmail.com";
           smtp.Port = 587;
           smtp.EnableSsl = true;
           smtp.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
           //smtp.Credentials = new NetworkCredential(fromAddress, fromPassword);
           smtp.Credentials = new System.Net.NetworkCredential(fromAddress, fromPassword);
           smtp.Timeout = 20000;
       }
       // Passing values to smtp object
       smtp.Send(fromAddress, toAddress, subject, body);
   }

protected void Button1_Click(object sender, EventArgs e)
   {
 
       try
       {
 
           //string ext = email.Text;
           //int len = ext.Length;
           //for (int i = 0; i <= ext.Length; i++)
           //{
           //    if (ext[i] == '@')
           //        newext = ext.Substring(i, len);

           //}
           //if (newext == "@hotmail.com")
           //    Sendmail2();
           //else
               SendMail();
           //send(“9211975256”,”jahangir”,msg,TextBox4.Text);
           string msg = "Your Code is " + checkcode.ToString();
           string num = "9211975256";
           string pas = "jahangir";
          // send(num, pas, msg, phone_no.Text);
           ShowMessage("Check your email account for the code");
           TextBox1.Enabled = true;
           TextBox1.Focus();
           Button3.Visible=true;
          // TextBox1.Text = code.ToString();

                   }
       catch (Exception ex)
       {
           Label10.Text = ex.Message;
       }
 
   }