Error: server does not support secure connections.

Question

After spending , couple of hours i couldn't find solution to this error . I create a application in MVC5 of sending certain fields data to the recipient's mail address after hit the submit button. But when i clicked on it , i got a error i.e. "An exception of type 'System.Net.Mail.SmtpException' occurred in System.dll but was not handled in user code
Additional information: Server does not support secure connections. "

What I have tried:

 

 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Mvc;

using SendEmail.Models;

using System.Net;

using System.Net.Mail;

using System.IO;

namespace SendEmail.Controllers

{

public class GetSendEmailController : Controller

{

// GET: GetSendEmail

// action method handle get operation and simply return view

public ActionResult Index()

{

return View();

}

// action method for handle the call made by the post function from the view

[HttpPost]

public ActionResult Index( EmailModel model)

{

using(var mailmessage = new MailMessage(model.Email,model.To))

{

mailmessage.Body = model.Body;

mailmessage.Subject = model.Subject;

if(model.Attachment.ContentLength > 0)

{

string filename = Path.GetFileName(model.Attachment.FileName);

mailmessage.Attachments.Add(new Attachment(model.Attachment.InputStream, filename));

}

mailmessage.IsBodyHtml = false;

using(var smtpclient = new SmtpClient())

{

smtpclient.Host = "smtp.gmail.com";

smtpclient.EnableSsl = true;

//NetworkCredential networkcredential = new NetworkCredential(model.Email, model.Password);

smtpclient.Credentials = new NetworkCredential(model.Email, model.Password);

smtpclient.UseDefaultCredentials = false;

//smtpclient.Credentials = networkcredential;

smtpclient.Port = 587;

smtpclient.Send(mailmessage); // got error

ViewBag.Message = "Email has been successfully sent...!!! ";

}

}

return View();

}

}

}

 

 

 

Give some hint in which way should i have to proceed to go...!!!