(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_CkEmail.h>
#include <C_CkMailMan.h>

void ChilkatSample(void)
    {
    HCkEmail email;
    BOOL success;
    HCkMailMan mailman;
    const char *mimeStr;

    email = CkEmail_Create();

    CkEmail_putSubject(email,"test");
    CkEmail_putBody(email,"test");
    CkEmail_AddTo(email,"Joe","joe@example1.com");
    CkEmail_putFrom(email,"mary@example2.com");

    mailman = CkMailMan_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:
    CkMailMan_putAutoGenMessageId(mailman,FALSE);
    CkEmail_AddHeaderField(email,"Message-ID","<xyz123@abc>");

    mimeStr = CkMailMan_renderToMime(mailman,email);
    printf("%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

    printf("--------\n");

    // If we auto-generate...
    CkMailMan_putAutoGenMessageId(mailman,TRUE);
    mimeStr = CkMailMan_renderToMime(mailman,email);
    printf("%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


    CkEmail_Dispose(email);
    CkMailMan_Dispose(mailman);

    }