Error in Sending Email through Gmail

Question

I have been trying to send Email in Asp.Net Core 3.1.But I always keep on getting this error System.Net.Mail.SmtpException: Server does not support secure connections.

 

My Source Code-

var fromAddress = new MailAddress("[email protected]", "Atulya Raj");
var toAddress = new MailAddress("[email protected]", "Name");
const string fromPassword = "password";
const string subject = "Test";
string body = "Hello"
var smtp = new SmtpClient
{
Host = "smtp.gmail.com",
Port = 587,
EnableSsl = true,
DeliveryMethod = SmtpDeliveryMethod.Network,
UseDefaultCredentials = false,
Credentials = new NetworkCredential(fromAddress.Address, fromPassword)
};
using (var message = new MailMessage(fromAddress, toAddress)
{
Subject = subject,
Body = body
})
{
smtp.Send(message);
}

Any help would be nice.Thanks.