Sendgrid - Unity Email via SMTP

sgSMTP

MailMessage mail = new MailMessage();
	
mail.From = new MailAddress(fromEmail);
mail.To.Add(toEmail);
mail.Subject = subject;
mail.Body = body;
mail.Headers.Add("X-SMTPAPI", xsmtpapiJSON);

SmtpClient smtpServer = new SmtpClient("smtp.sendgrid.net");
smtpServer.Port = 587;
smtpServer.Credentials = new System.Net.NetworkCredential(api_user, api_key) as ICredentialsByHost;
smtpServer.EnableSsl = true;
ServicePointManager.ServerCertificateValidationCallback = 
  delegate(object s, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors) 
      { return true; };
smtpServer.Send(mail);
Debug.Log("Success, email sent through SMTP!");