using MailKit.Net.Smtp;
using MailKit.Security;
using MimeKit;
using System.Threading.Tasks;

namespace ConsoleApp1
{
 public class MailHelper
 {
  public static void Send(string email, string subject, string message)
  {
   var emailMessage = new MimeMessage();
   emailMessage.From.Add(new MailboxAddress("tianwei blogs", "mail@hantianwei.cn"));
   emailMessage.To.Add(new MailboxAddress("mail", email));
   emailMessage.Subject = subject;
   emailMessage.Body = new TextPart("plain") { Text = message };

   using (var client = new SmtpClient())
   {
    client.Connect("smtp.hantianwei.cn", 465, true);
    client.Authenticate("mail@hantianwei.cn", "******");

    client.Send(emailMessage);
    client.Disconnect(true);

   }
  }

  public static async Task SendEmailAsync(string email, string subject, string message)
  {
   var emailMessage = new MimeMessage();

   emailMessage.From.Add(new MailboxAddress("tianwei blogs", "mail@hantianwei.cn"));
   emailMessage.To.Add(new MailboxAddress("mail", email));
   emailMessage.Subject = subject;
   emailMessage.Body = new TextPart("plain") { Text = message };

   using (var client = new SmtpClient())
   {
    await client.ConnectAsync("smtp.hantianwei.cn", 25, SecureSocketOptions.None).ConfigureAwait(false);
    await client.AuthenticateAsync("mail@hantianwei.cn", "******");
    await client.SendAsync(emailMessage).ConfigureAwait(false);
    await client.DisconnectAsync(true).ConfigureAwait(false);
    
   }
  }

 }
}