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 = 587;//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  
  
}