C#发送邮件Email

MailMessage msg = new MailMessage();
msg.To.Add("xxxx@qq.com");
msg.From = new MailAddress ("xxxx@qq.com","Zaine");

msg.Subject = "你好，小号！";
msg.SubjectEncoding = Encoding.UTF8;

msg.Attachments.Add(new Attachment(@"F:\demo.bak"));

msg.Body = "好久不见，你还好吗？";
msg.BodyEncoding = Encoding.UTF8;

SmtpClient client = new SmtpClient();
client.EnableSsl = true;
client.Host = "smtp.qq.com";
client.Port = 587;
client.Credentials = new NetworkCredential("xxxx@qq.com", "xxxx*xx");

client.Send(msg);