如何测试Hotmail帐户是否存在

Question

我正在尝试测试我的hotmail帐户是否存在，但下面的代码没有帮助我。

public bool IsExists_SMTPMethod(string email)
{
    string domain = email.Substring(email.IndexOf("@") + 1);
    var servers = _commander.GetMXServers(domain);
    Socket socket = null;
    foreach (MXServer mxserver in servers)
    {
        IPHostEntry ipHost = Dns.Resolve(mxserver.MailExchanger);
        IPEndPoint endPoint = new IPEndPoint(ipHost.AddressList[0], 25);
        socket = new Socket(endPoint.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
        socket.Connect(endPoint);
        if (!CheckResponse(socket, ResponseEnum.ConnectSuccess))
        {
            socket.Close();
        }
        else
        {
            // If connected, send SMTP commands
            {
                SendData(socket, string.Format("HELO {0}rn", "machinename"));
                if (!CheckResponse(socket, ResponseEnum.GenericSuccess))
                {
                    socket.Close();
                    continue;
                }
                SendData(socket, string.Format("MAIL FROM:  <{0}>rn", "[e-mail]"));
                CheckResponse(socket, ResponseEnum.GenericSuccess);
                SendData(socket, string.Format("RCPT TO:  <{0}>rn", email));
                bool result = CheckResponse(socket, ResponseEnum.GenericSuccess);
                if (!result)
                {
                    socket.Close();
                    continue;
                }
                else
                    return true;
            }
        }
    }
    return false;
}

Answer 1

关于这个问题有很多，其中很多都有一个大致的答案。如果您要发送的SMTP服务器允许，您可以使用RCPT to, VRFY或EXPN等SMTP命令来确认电子邮件地址是否存在。

问题是，看起来hotmail不允许这样做。

下面的代码适用于gmail(并验证用户是否在那里)，但你不能用它来验证hotmail地址-他们的SMTP服务器返回无效的一切

var email = "[e-mail]";
TcpClient tClient = new TcpClient("gmail-smtp-in.l.google.com", 25);
string CRLF = "rn";
byte[] dataBuffer;
string ResponseString;
NetworkStream netStream = tClient.GetStream();
StreamReader reader = new StreamReader(netStream);
ResponseString = reader.ReadLine();
/* Perform HELO to SMTP Server and get Response */
dataBuffer = BytesFromString("HELO KirtanHere" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
dataBuffer = BytesFromString("MAIL FROM:<[e-mail]>" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
/* Read Response of the RCPT TO Message to know from google if it exist or not */
dataBuffer = BytesFromString("RCPT TO:<"+email+">"+CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
ResponseString = reader.ReadLine();
if (GetResponseCode(ResponseString) == 550)
{
    Console.WriteLine("Mail Address Does not Exist");
    Console.WriteLine("Original Error from Smtp Server "+ResponseString);
}
else
{
    Console.WriteLine("Original response from Smtp Server "+ResponseString);
}
/* QUITE CONNECTION */
dataBuffer = BytesFromString("QUITE" + CRLF);
netStream.Write(dataBuffer, 0, dataBuffer.Length);
tClient.Close();

像这样的东西会让你登录到hotmail的SMTP发送电子邮件，但它不会返回是否电子邮件是正确的，只要你的凭证是正确的。

try
{
    SmtpClient SmtpServer = new SmtpClient("smtp.live.com"); 
    SmtpServer.EnableSsl = true;
    SmtpServer.UseDefaultCredentials = false;
    SmtpServer.Port = 587;
    SmtpServer.Credentials = new System.Net.NetworkCredential("[e-mail]", "password");
    var message = new MailMessage {
    From = new MailAddress("[e-mail]"),
    Subject = "test"
    };
    message.To.Add("[e-mail]");
    SmtpServer.Send(message);
}
catch(SmtpException x)
{
    //This unfortunately only really calls authentication failures
    Console.WriteLine(x.ToString());
}

我的建议是在你的电子邮件中给这些人发送一个激活链接，如果他们点击它，它会将他们的电子邮件设置为验证，这样你就知道你可以给他们发送电子邮件。然后你还必须确保你不发送未经认证的电子邮件，否则你将电子邮件发送到一个巨大的黑洞。

这里有一些参考资料，供过去问过这个问题的人参考。

验证邮箱中是否存在电子邮件

我可以使用。net检查电子邮件地址是否存在吗?

如何检查给定的电子邮件地址是否实际存在于c#中?