Reading emails using OpenPop library. Problem with Message-ID.

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C#

email

Hi,
so, I need to read all emails from email server (public, free, web provider), with POP3. I use OpenPop library (I do some research, and still not sure about that choice).

Received emails I want to save in my database. To identify, whether email already is in database i want to use message-ID (save it in separate column). It is uniq value for every email in my inbox, right?

But, what the problem:
I received almost all emails with no problem. Emails with problem (with null message-ID) were from CodeProject newsletter and from myself (I send some emails from C# code for test). Those emails were received with messageID == null.

How is that possible, can anybody explain me?

Here is my test code:

pop3Client = new Pop3Client();

    if (pop3Client.Connected)
        pop3Client.Disconnect();

    pop3Client.Connect("poczta.o2.pl", 995, true);
    pop3Client.Authenticate("mnd017@com", "231231");

    int count = pop3Client.GetMessageCount();

    for (int i = count; i >= 1; i -= 1)
    {
        // Check if the form is closed while we are working. If so, abort
        if (IsDisposed)
            return;

        // Refresh the form while fetching emails
        // This will fix the "Application is not responding" problem
        Application.DoEvents();
        Message message = pop3Client.GetMessage(i);
        try
        {
// Here I try to read that: message.Headers.MessageId.ToString() - but MessageId is null :/
}
        catch (Exception e)
        {
            fail++;
        }
    }