测试SMTP服务器通过C＃运行 [英] Testing SMTP server is running via C#

问题描述

如何测试SMTP启动并通过C＃运行没有发送消息。

How can I test SMTP is up and running via C# without sending a message.

我当然可以尝试：

try{
// send email to "[e-mail]"
}
catch
{
// log "smtp is down"
}

有必须要做到这一点更整洁的方式。

There must be a more tidy way to do this.

推荐答案

您可以尝试说 EHLO 您的服务器，看看它是否与响应250 OK 。当然，本次测试没有向你保证，你一定会成功后发送邮件，但它是一个很好的迹象。

You can try saying EHLO to your server and see if it responds with 250 OK. Of course this test doesn't guarantee you that you will succeed sending the mail later, but it is a good indication.

这是一个示例：

class Program
{
    static void Main(string[] args)
    {
        using (var client = new TcpClient())
        {
            var server = "smtp.gmail.com";
            var port = 465;
            client.Connect(server, port);
            // As GMail requires SSL we should use SslStream
            // If your SMTP server doesn't support SSL you can
            // work directly with the underlying stream
            using (var stream = client.GetStream())
            using (var sslStream = new SslStream(stream))
            {
                sslStream.AuthenticateAsClient(server);
                using (var writer = new StreamWriter(sslStream))
                using (var reader = new StreamReader(sslStream))
                {
                    writer.WriteLine("EHLO " + server);
                    writer.Flush();
                    Console.WriteLine(reader.ReadLine());
                    // GMail responds with: 220 mx.google.com ESMTP
                }
            }
        }
    }
}

和这里的codeS ，以期望列表

And here's the list of codes to expect.

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