Send S/MIME Signed and Encrypted Email

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Sending a signed and encrypted email is as easy as setting both the SendEncrypted and SendSigned properties. The email is signed using the private key of the sender's certificate, and encrypted using the public key of the recipient's certificate.

// 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.comcast.net";

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

email.Subject = "This email is signed and encrypted";
email.Body = "This is a digitally signed and encrypted mail";
email.From = "Chilkat Support <admin@chilkatsoft.com>";
email.AddTo("Joe","joe@gmail.com");

// To send signed and encrypted email, set both
// SendSigned and SendEncrypted:
email.SendSigned = true;
email.SendEncrypted = true;

success = mailman.SendEmail(email);
if (success != true) {
    MessageBox.Show(mailman.LastErrorText);
}
else {
    MessageBox.Show("Mail Sent!");
}