问题描述

如何在不发送消息的情况下通过 C# 测试 SMTP 是否启动并运行.

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

我当然可以试试:

try{
// send email to "nonsense@example.com"
}
catch
{
// log "smtp is down"
}

必须有一个更整洁的方法来做到这一点.

There must be a more tidy way to do this.

推荐答案

你可以试试对您的服务器说 EHLO 并查看它是否以 250 OK 响应.当然这个测试并不能保证你以后一定能成功发送邮件，但这是一个很好的迹象.

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
                }
            }
        }
    }
}

这是代码列表期待.

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