(Unicode C) Auto-Generate or Explicitly Specify the Message-ID Email Header

Demonstrates how to auto-generate or explicitly specify the Message-ID header field.

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#include <C_CkEmailW.h>
#include <C_CkMailManW.h>

void ChilkatSample(void)
    {
    HCkEmailW email;
    BOOL success;
    HCkMailManW mailman;
    const wchar_t *mimeStr;

    email = CkEmailW_Create();

    CkEmailW_putSubject(email,L"test");
    CkEmailW_putBody(email,L"test");
    CkEmailW_AddTo(email,L"Joe",L"joe@example1.com");
    CkEmailW_putFrom(email,L"mary@example2.com");

    mailman = CkMailManW_Create();

    // When the mailman sends email, it renders the email to be sent,
    // and then sends the rendered MIME.

    // Instead of actually sending the email, this example will render
    // to MIME so we can see what would be sent..

    // We can explicitly set the Message-ID like this:
    CkMailManW_putAutoGenMessageId(mailman,FALSE);
    CkEmailW_AddHeaderField(email,L"Message-ID",L"<xyz123@abc>");

    mimeStr = CkMailManW_renderToMime(mailman,email);
    wprintf(L"%s\n",mimeStr);

    // This is what we get:

    // MIME-Version: 1.0
    // Date: Mon, 20 Jul 2020 17:20:09 -0500
    // Message-ID: <xyz123@abc>
    // Content-Type: text/plain; charset=us-ascii; format=flowed
    // Content-Transfer-Encoding: 7bit
    // X-Priority: 3 (Normal)
    // Subject: test
    // To: Joe <joe@example1.com>
    // From: mary@example2.com
    // 
    // test

    wprintf(L"--------\n");

    // If we auto-generate...
    CkMailManW_putAutoGenMessageId(mailman,TRUE);
    mimeStr = CkMailManW_renderToMime(mailman,email);
    wprintf(L"%s\n",mimeStr);

    // We get this:

    // MIME-Version: 1.0
    // Date: Mon, 20 Jul 2020 17:21:20 -0500
    // Message-ID: <04EDE096BBFE484967F6398A973B0FCF6EA09A44@CHILKATSLICE>
    // Content-Type: text/plain; charset=us-ascii; format=flowed
    // Content-Transfer-Encoding: 7bit
    // X-Priority: 3 (Normal)
    // Subject: test
    // To: Joe <joe@example1.com>
    // From: mary@example2.com
    // 
    // test


    CkEmailW_Dispose(email);
    CkMailManW_Dispose(mailman);

    }