使用.net测试SMTP

using System;
using System.Net.Mail;

namespace SMTPTest
{
    class Program
    {
        static void Main(string[] args)
        {
            // 创建SMTP客户端实例
            SmtpClient smtpClient = new SmtpClient("smtp.example.com", 587);

            // 设置登录凭据
            smtpClient.Credentials = new System.Net.NetworkCredential("username", "password");

            // 创建邮件消息实例
            MailMessage mailMessage = new MailMessage();
            mailMessage.From = new MailAddress("sender@example.com");
            mailMessage.To.Add("recipient@example.com");
            mailMessage.Subject = "Test Email";
            mailMessage.Body = "This is a test email sent using SMTP in .NET.";

            // 发送邮件
            try
            {
                smtpClient.Send(mailMessage);
                Console.WriteLine("Email sent successfully.");
            }
            catch (Exception ex)
            {
                Console.WriteLine("Failed to send email: " + ex.Message);
            }
        }
    }
}