在ASP.net中不使用SMTP发送电子邮件

using System;
using System.Net.Mail;

public class EmailSender
{
    public void SendEmail(string to, string subject, string body)
    {
        MailMessage mail = new MailMessage();
        mail.From = new MailAddress("your-email@example.com");
        mail.To.Add(to);
        mail.Subject = subject;
        mail.Body = body;

        SmtpClient smtpClient = new SmtpClient("smtp.example.com", 25);
        smtpClient.Credentials = new System.Net.NetworkCredential("username", "password");
        smtpClient.EnableSsl = true;

        try
        {
            smtpClient.Send(mail);
            Console.WriteLine("Email sent successfully.");
        }
        catch (Exception ex)
        {
            Console.WriteLine("Failed to send email. Error message: " + ex.Message);
        }
    }
}