Question

我正在使用this project中的代码编写自己的SMTP服务器。

到目前为止，我有这段代码（只是我上面链接的项目的片段）：

TcpListener listener = new TcpListener(IPAddress.Any, nListeningPort);
listener.Start();

TcpClient client = listener.AcceptTcpClient();
client.ReceiveTimeout = 5000;
NetworkStream stream = client.GetStream();

//How do I authenticate incoming SMTP connection?
//In other words, how do I check user name and password?

//Begin reading stream
System.IO.StreamReader reader;
System.IO.StreamWriter writer;

reader = new System.IO.StreamReader(stream);
writer = new System.IO.StreamWriter(stream);
writer.NewLine = "\r\n";
writer.AutoFlush = true;

for (string line = reader.ReadLine(); line != null; line = reader.ReadLine())
{
    Console.WriteLine("Read line {0}", line);

    switch (line)
    {
        case "DATA":
            writer.WriteLine("354 Start input, end data with <CRLF>.<CRLF>");
            StringBuilder data = new StringBuilder();

            //And so on...

            writer.WriteLine("250 OK");
            client.Close();
            break;

        //Other cases...
    }
}

它工作正常，但它接受任何SMTP连接。

我的问题是如何对其进行身份验证，或检查正确的使用名称和密码？

编辑：我刚刚意识到添加以下内容非常重要。我需要为我们的Intranet编写此SMTP服务器代码，以便为来自某个特定应用程序的出站电子邮件提供服务（我无法控制源代码。）

该应用程序显然使用Redemption.SafeMailItem对象作为SMTP客户端发送电子邮件。这是我从拆解它得到的伪代码：

//Code below was extracted using dotPeek

Microsoft.Office.Interop.Outlook.Application application = Interaction.CreateObject("Outlook.Application", "");
SafeMailItem safeMailItem = Interaction.CreateObject("Redemption.SafeMailItem", "");

MailItem mailItem = application.CreateItem(OlItemType.olMailItem);
safeMailItem.Item = mailItem;

safeMailItem.Recipients.Add(strRecipient);
safeMailItem.Body = sBody;

safeMailItem.Attachments.Add((object) strPath, (object) Missing.Value, (object) Missing.Value, (object) Missing.Value);

NewLateBinding.LateSet((object) safeMailItem, (Type) null, "Subject", new object[1]
{
     (object) sSubject
}, (string[]) null, (Type[]) null);

safeMailItem.Send();
application.GetNamespace("MAPI").SyncObjects[(object) 1].Start();

如何在SMTP服务器中验证传入的电子邮件传输？

0 个答案: