C#实现邮件发送功能

            MailAddress from = new MailAddress("sender gmail");
            MailAddress to = new MailAddress("receiver mail");
            MailMessage mail = new MailMessage(from,to);
            mail.Subject = "send email";
            mail.Body = "u r a good boy!";

            SmtpClient client = new SmtpClient();
            client.Credentials = new System.Net.NetworkCredential("sender mail", "sender psw");
            client.Host = "smtp.gmail.com";
            client.Port = 587;
            client.EnableSsl = true;
            try
            {
                client.Send(mail);
                MessageBox.Show("OK");
            }
            catch(SmtpException ex)
            {
                MessageBox.Show(ex.ToString());
            }