Send Signed Email using PFX File

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file.

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

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

//  Set the SMTP server.
mailman.SmtpHost = "smtp.mymailserver.com";

//  Create a new email object
Chilkat.Email email = new Chilkat.Email();

email.Subject = "This email is signed";
email.Body = "This is a digitally signed mail";
email.From = "Chilkat Admin <admin@chilkatsoft.com>";
email.AddTo("Chilkat Support","support@chilkatsoft.com");

//  Indicate that the email should be sent signed.
email.SendSigned = true;

//  Create an instance of a certificate store object, load a PFX file,
//  locate the certificate we need, and use it for signing.
//  (a PFX file may contain more than one certificate.)
Chilkat.CertStore certStore = new Chilkat.CertStore();
//  The 1st argument is the filename, the 2nd arg is the
//  PFX file's password:
success = certStore.LoadPfxFile("chilkatsoft_secret.pfx","secret");
if (success != true) {
    MessageBox.Show(certStore.LastErrorText);
    return;
}

Chilkat.Cert cert = null;
cert = certStore.FindCertBySubjectE("admin@chilkatsoft.com");
if (cert == null ) {
    MessageBox.Show(certStore.LastErrorText);
    return;
}

//  If a PFX file is known to contain a single certificate,
//  you may load it directly into a Chilkat certificate object.
//  This snippet of source code shows how:
Chilkat.Cert cert2 = new Chilkat.Cert();
//  The 1st argument is the filename, the 2nd arg is the
//  PFX file's password:
success = cert2.LoadPfxFile("chilkatsoft_secret.pfx","secret");
if (success != true) {
    MessageBox.Show(cert.LastErrorText);
    return;
}

//  This example will use the cert from the certStore...
email.SetSigningCert(cert);

//  Send a signed email.
success = mailman.SendEmail(email);
if (success != true) {
    MessageBox.Show(mailman.LastErrorText);
}
else {
    //  The LastErrorText property provides information
    //  even when successful.
    MessageBox.Show(mailman.LastErrorText);
    MessageBox.Show("Mail Sent!");
}