C#如何利用QQ邮箱SMTP发送邮件

 public void SendEmail()
 {
     MailMessage msg = new MailMessage();  

     msg.To.Add("to@qq.com");//收件人地址
     //msg.CC.Add("cc@qq.com");//抄送人地址  

     msg.From = new MailAddress("from@qq.com", "Edward");//发件人邮箱，名称  

     msg.Subject = "This is a test email from QQ";//邮件标题
     msg.SubjectEncoding = Encoding.UTF8;//标题格式为UTF8  

     msg.Body = "this is body";//邮件内容
     msg.BodyEncoding = Encoding.UTF8;//内容格式为UTF8  

     SmtpClient client = new SmtpClient();  

     client.Host = "smtp.qq.com";//SMTP服务器地址
     client.Port = ;//SMTP端口，QQ邮箱填写587  

     client.EnableSsl = true;//启用SSL加密  

     client.Credentials = new NetworkCredential("from@qq.com", "password");//发件人邮箱账号，密码(此处为授权码)  

     client.Send(msg);//发送邮件  

 }