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 Email ActiveX

<?php

//  The mailman object is used for receiving (POP3)
//  and sending (SMTP) email.
$mailman = new COM("Chilkat.MailMan2");

//  Any string argument automatically begins the 30-day trial.
$success = $mailman->UnlockComponent('30-day trial');
if ($success != true) {
    print 'Component unlock failed' . "\n";
    exit;
}

//  Set the GMail account POP3 properties.
$mailman->MailHost = 'pop.gmail.com';
$mailman->PopUsername = 'myLogin';
$mailman->PopPassword = '****';
$mailman->PopSsl = true;
$mailman->MailPort = 995;

//  Use our certificate, which is already installed
//  in our current-user certificate store on the computer.
$clientCert = new COM("Chilkat.Cert");
$success = $clientCert->LoadByCommonName('Chilkat Software, Inc.');
if ($success != true) {
    print $clientCert->lastErrorText() . "\n";
    exit;
}

//  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) {
    print $mailman->lastErrorText() . "\n";
    exit;
}

//  Let's look at the LastErrorText to see the details
//  of the successful connection.  We should see our cert:
print $mailman->lastErrorText() . "\n";

//  OK, now examine the server's cert:

$serverCert = $mailman->GetPop3SslServerCert();
if (is_null($serverCert)) {
    print 'No server cert available.' . "\n";
}
else {
    print 'Server SSL certificate:' . "\n";
    print $serverCert->subjectDN() . "\n";

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

}

?>