Send S/MIME Signed Email

Send digitally signed email using the digital certificate of the recipient. To successfully sign, the sender's certificate must be pre-installed with private key. Typically, this is done via a .pfx file, or through Internet Explorer. If your code is going to run within ASP, ASP.NET, or a Windows Service, you will need to follow the instructions here (http://blog.chilkatsoft.com/?p=149) to import your certificate w/ private key such that it is accessible by the calling process.

Download Chilkat Email ActiveX

Download 32-bit Chilkat IMAP ActiveX (.msi)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

<?php

//  The mailman object is used for sending and receiving 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 SMTP server.
$mailman->SmtpHost = 'smtp.chilkatsoft.com';

$mailman->SmtpUsername = 'myLogin';
$mailman->SmtpPassword = 'myPassword';

//  Create a new email object
$email = new COM("Chilkat.Email2");

$email->Subject = 'This email is signed';
$email->Body = 'This is a digitally signed mail';
$email->From = 'Chilkat Support <admin@chilkatsoft.com>';
$email->AddTo('Test','test@testemail.net');

//  In this example, we've already installed the certificate for "admin@chilkatsoft.com"
//  (with private key) in the current user's personal certificate store.
//  If the email.SendSigned property is set, Chilkat will
//  automatically search for and use the first non-expired certificate
//  matching the sender's email address.  Chilkat searches
//  the Current User's Personal certificate store, as well
//  as the Local Machine's Personal certificate store.
//  Run certmgr.msc to view the certs in the Current User's
//  certificate store.
$email->SendSigned = true;

$success = $mailman->SendEmail($email);
if ($success != true) {
    print $mailman->lastErrorText() . "\n";
}
else {
    print $mailman->lastErrorText() . "\n";
    print 'Mail Sent!' . "\n";
}

?>