Send S/MIME Signed Email

Send digitally signed email using the digital certificate of the recipient. To successfully sign, the sender's certificate must be pre-installed with private key. Typically, this is done via a .pfx file, or through Internet Explorer. If your code is going to run within ASP, ASP.NET, or a Windows Service, you will need to follow the instructions here (http://blog.chilkatsoft.com/?p=149) to import your certificate w/ private key such that it is accessible by the calling process.

Downloads:

MS Windows Visual C/C++ Libraries

Linux/CentOS C/C++ Libraries

MAC OS X C/C++ Libraries

Solaris C/C++ Libraries

C++ Builder Libraries

#include <C_CkMailMan.h>
#include <C_CkEmail.h>

void ChilkatSample(void)
    {
    HCkMailMan mailman;
    BOOL success;
    HCkEmail email;

    //  The mailman object is used for sending and receiving email.
    mailman = CkMailMan_Create();

    //  Any string argument automatically begins the 30-day trial.

    success = CkMailMan_UnlockComponent(mailman,"30-day trial");
    if (success != TRUE) {
        printf("Component unlock failed\n");
        return;
    }

    //  Set the SMTP server.
    CkMailMan_putSmtpHost(mailman,"smtp.chilkatsoft.com");

    CkMailMan_putSmtpUsername(mailman,"myLogin");
    CkMailMan_putSmtpPassword(mailman,"myPassword");

    //  Create a new email object
    email = CkEmail_Create();

    CkEmail_putSubject(email,"This email is signed");
    CkEmail_putBody(email,"This is a digitally signed mail");
    CkEmail_putFrom(email,"Chilkat Support <admin@chilkatsoft.com>");
    CkEmail_AddTo(email,"Test","test@testemail.net");

    //  In this example, we've already installed the certificate for "admin@chilkatsoft.com"
    //  (with private key) in the current user's personal certificate store.
    //  If the email.SendSigned property is set, Chilkat will
    //  automatically search for and use the first non-expired certificate
    //  matching the sender's email address.  Chilkat searches
    //  the Current User's Personal certificate store, as well
    //  as the Local Machine's Personal certificate store.
    //  Run certmgr.msc to view the certs in the Current User's
    //  certificate store.
    CkEmail_putSendSigned(email,TRUE);

    success = CkMailMan_SendEmail(mailman,email);
    if (success != TRUE) {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
    }
    else {
        printf("%s\n",CkMailMan_lastErrorText(mailman));
        printf("Mail Sent!\n");
    }


    CkMailMan_Dispose(mailman);
    CkEmail_Dispose(email);

    }