(PHP ActiveX) Send Encrypted Email to Multiple Recipients

Demonstrates how to create and send an S/MIME encrypted email to multiple recipients. The digital certificate of each recipient is required. The encrypting/sending process uses each recipient's digital certificate (which internally contains the public key). Each recipient decrypts the received email using his/her private key.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// The mailman object is used for sending and receiving email.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.MailMan')
$mailman = new COM("Chilkat.MailMan");

// Set the SMTP server.
$mailman->SmtpHost = 'smtp.mymailserver.com';

// Load each recipient's certificate into a Chilkat certificate object.
// This example loads the certificates from files.  However, the Chilkat
// certificate object provides other means for loading certificates,
// such as from in-memory PEM strings, or in-memory binary DER encoded form, etc.
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Cert')
$cert1 = new COM("Chilkat.Cert");
$success = $cert1->LoadFromFile('recipient1.cer');
if ($success != 1) {
    print $cert1->LastErrorText . "\n";
    exit;
}

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Cert')
$cert2 = new COM("Chilkat.Cert");
$success = $cert2->LoadFromFile('recipient2.cer');
if ($success != 1) {
    print $cert2->LastErrorText . "\n";
    exit;
}

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Cert')
$cert3 = new COM("Chilkat.Cert");
$success = $cert3->LoadFromFile('recipient3.cer');
if ($success != 1) {
    print $cert3->LastErrorText . "\n";
    exit;
}

// Create a new email object
// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Email')
$email = new COM("Chilkat.Email");

$email->Subject = 'This email is encrypted and sent to 3 recipients';
$email->Body = 'This is an S/MIME encrypted mail sent to 3 recipients';
$email->From = 'Chilkat Support <support@chilkatsoft.com>';

// Make each of the certificates available for encrypting the email
// by calling AddEncryptCert for each.
$success = $email->AddEncryptCert($cert1);
if ($success == 1) {
    $success = $email->AddEncryptCert($cert2);
}

if ($success == 1) {
    $success = $email->AddEncryptCert($cert3);
}

if ($success != 1) {
    print $email->LastErrorText . "\n";
    exit;
}

// Add 3 recipients to the email (2 TO addresses, and 1 CC address)
$success = $email->AddTo('Recipient 1','admin@cknotes.com');
$success = $email->AddTo('Recipient 2','somebody001122@yahoo.com');
$success = $email->AddCC('Recipient 3','somebody123xyz@gmail.com');

// Indicate that the email is to be sent encrypted.
$email->SendEncrypted = 1;

// Send the encrypted email...
$success = $mailman->SendEmail($email);
if ($success != 1) {
    print $mailman->LastErrorText . "\n";
}
else {
    print 'Encrypted Email Sent!' . "\n";
}


?>