Send Digitally Signed Email

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C++ source code to send digitally signed mail.

#define _CRTDBG_MAP_ALLOC
#include <windows.h>
#include <stdio.h>
#include <crtdbg.h>

#include "C:/ck2000/components/ChilkatLib/Package/Include/CkSettings.h"
#include "C:/ck2000/components/ChilkatLib/Package/Include/CkCert.h"
#include "C:/ck2000/components/ChilkatLib/Package/Include/CkEmail.h"
#include "C:/ck2000/components/ChilkatLib/Package/Include/CkEmailBundle.h"
#include "C:/ck2000/components/ChilkatLib/Package/Include/CkMailMan.h"
#include "C:/ck2000/components/ChilkatLib/Package/Include/CkString.h"
#include "C:/ck2000/components/ChilkatLib/Package/Include/CkByteData.h"

void EmailExample(void)
    {
    CkMailMan mailman;

    // Any string passed to UnlockComponent begins the 30-day trial.
    bool unlocked = mailman.UnlockComponent("30-day trial");
    if (!unlocked)
	{
	printf("Failed to unlock component\n");
	return;
	}

    mailman.put_SmtpHost("mail.earthlink.net");
    
    // Send a digitally signed email.
    CkEmail email;

    email.put_Body("This is the email body");

    email.AddTo("Chilkat Support","matt@chilkatsoft.com");
    
    email.put_Subject("This is the email subject");

    // Load a certificate from a file and use it for signing.
    CkCert cert;
    cert.LoadFromFile("myCert.cer");

    // The From address must match the email address in the certificate:
    email.put_FromAddress("support@chilkatsoft.com");

    // Check to make sure the certificate's email address matches.
    CkString certEmailAddr;
    cert.get_SubjectE(certEmailAddr);
    if (!certEmailAddr.equals("support@chilkatsoft.com"))
	{
	printf("Certificate email address (%s) does not match sender's email address.\n",
	    certEmailAddr.getString());
	return;
	}

    // Make sure we have the private key for signing.
    if (!cert.HasPrivateKey())
	{
	printf("Need private key for signing!\n");
	return;
	}

    // Use the certificate and indicate that the email should be signed.
    email.put_SendSigned(true);
    email.SetSigningCert(&cert);

    // Send the email
    if (!mailman.SendEmail(&email))
	{
	mailman.SaveLastError("errors.xml");
	}

    }

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)
{
    freopen("stdout.txt","w",stdout);

    EmailExample();

    CkSettings::cleanupMemory();

    _CrtDumpMemoryLeaks();

    return 0;
}