使用第三方SMTP服务器来发送邮件。如网易:

SmtpClient sc = new SmtpClient("smtp.126.com");
 sc.Credentials = new NetworkCredential("用户名", "密码");
  sc.Send("from@126.com",
                                "to@qq.com",
                                "主题",
                                "邮件正文");

 

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