Using a .cer Certificate File for Encrypted Email

Sends an encrypted email using the recipient's digital certificate from a .cer file.

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Download Chilkat .NET for 1.0 / 1.1 Framework

//  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";

//  Load the .cer file into a certificate object:
Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadFromFile("comodoChilkat.cer");
if (success != true) {
    MessageBox.Show(cert.LastErrorText);
    return;
}

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

email.Subject = "This email is encrypted";
email.Body = "This is a digitally encrypted mail";
email.From = "Chilkat Support <support@chilkatsoft.com>";
email.AddTo("Comodo Test","comodo@chilkatsoft.com");

//  Indicate that the email is to be sent encrypted.
email.SendEncrypted = true;

//  Specify the certificate:
email.SetEncryptCert(cert);

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