SSL POP3 with Certificates

Demonstrates how to use a client-side certificate with an SSL connection to a POP3 server. Also demonstrates how to get the POP3 server's SSL certificate.

Download Chilkat .NET for 2.0 / 3.5 Framework

Download Chilkat .NET for 1.0 / 1.1 Framework

//  The mailman object is used for receiving (POP3)
//  and sending (SMTP) 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 GMail account POP3 properties.
mailman.MailHost = "pop.gmail.com";
mailman.PopUsername = "chilkat.support";
mailman.PopPassword = "****";
mailman.PopSsl = true;
mailman.MailPort = 995;

//  Use our certificate, which is already installed
//  in our current-user certificate store on the computer.
Chilkat.Cert clientCert = new Chilkat.Cert();
success = clientCert.LoadByCommonName("Chilkat Software, Inc.");
if (success != true) {
    MessageBox.Show(clientCert.LastErrorText);
    return;
}

//  Note: The GMail POP3 server does not require that you
//  have a client cert.  This example only demonstrates
//  how you may use a client certificate.  Typically,
//  higher-security systems may require a client-side SSL cert.
mailman.SetSslClientCert(clientCert);

//  Establish a POP3 connection:
success = mailman.Pop3BeginSession();
if (success != true) {
    MessageBox.Show(mailman.LastErrorText);
    return;
}

//  Let's look at the LastErrorText to see the details
//  of the successful connection.  We should see our cert:
textBox1.Text += mailman.LastErrorText + "\r\n";

//  OK, now examine the server's cert:
Chilkat.Cert serverCert = null;
serverCert = mailman.GetPop3SslServerCert();
if (serverCert == null ) {
    MessageBox.Show("No server cert available.");
}
else {
    textBox1.Text += "Server SSL certificate:" + "\r\n";
    textBox1.Text += serverCert.SubjectDN + "\r\n";

    //  Was the server certificate verified?
    //  It's not necessarily an error if the SSL Server cert is not verified.
    if (mailman.Pop3SslServerCertVerified == true) {
        textBox1.Text += "Server SSL certificate was verified." + "\r\n";
    }
    else {
        textBox1.Text += "Server SSL certificate was NOT verified!" + "\r\n";
    }

}