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());
}