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.

Download Chilkat C++ Libraries for VC++ 8.0 / Win32

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Download Chilkat C++ Libraries for VC++ 6.0 / Win32

#include <CkMailMan.h>
#include <CkEmail.h>

void ChilkatSample(void)
    {
    // The mailman object is used for sending and receiving email.
    CkMailMan mailman;

    // Any string argument automatically begins the 30-day trial.
    bool success;
    success = mailman.UnlockComponent("30-day trial");
    if (success != true) {
        printf("Component unlock failed\n");
        return;
    }

    // Set the SMTP server.
    mailman.put_SmtpHost("smtp.comcast.net");

    // Create a new email object
    CkEmail email;

    email.put_Subject("This email is signed");
    email.put_Body("This is a digitally signed mail");
    email.put_From("Chilkat Support <admin@chilkatsoft.com>");
    email.AddTo("TagTooga","admin@tagtooga.com");

    // 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.
    email.put_SendSigned(true);

    success = mailman.SendEmail(email);
    if (success != true) {
        printf("%s\n",mailman.lastErrorText());
    }
    else {
        printf("Mail Sent!\n");
    }

    }