使用SmtpClient时如何保存电子邮件而不是发送？

MailMessage mail = new MailMessage();
mail.From = new MailAddress("your_email@example.com");
mail.To.Add("recipient@example.com");
mail.Subject = "Test Email";
mail.Body = "This is a test email.";

SmtpClient client = new SmtpClient("smtp.example.com", 587);
client.Credentials = new NetworkCredential("your_email@example.com", "your_password");
client.EnableSsl = true;
client.DeliveryMethod = SmtpDeliveryMethod.SpecifiedPickupDirectory;
client.PickupDirectoryLocation = @"C:\Emails";
client.Send(mail);