Add DKIM example

class.phpmailer.php

@@ -395,7 +395,7 @@ class PHPMailer
 
     /**
      * DKIM Identity.
-     * Usually the email address used as the source of the email
+     * Usually the email address used as the source of the email.
      * @var string
      */
     public $DKIM_identity = '';

examples/DKIM.phps

@@ -0,0 +1,38 @@
+<?php
+/**
+ * This example shows how to use DKIM message authentication with PHPMailer.
+ * There's more to using DKIM than just this code - check out this article:
+ * @link https://yomotherboard.com/how-to-setup-email-server-dkim-keys/
+ * See also the DKIM code in the PHPMailer unit tests,
+ * which shows how to make a key pair from PHP.
+ */
+
+require '../PHPMailerAutoload.php';
+
+//Create a new PHPMailer instance
+$mail = new PHPMailer;
+//Set who the message is to be sent from
+$mail->setFrom('[email protected]', 'First Last');
+//Set an alternative reply-to address
+$mail->addReplyTo('[email protected]', 'First Last');
+//Set who the message is to be sent to
+$mail->addAddress('[email protected]', 'John Doe');
+//Set the subject line
+$mail->Subject = 'PHPMailer DKIM test';
+//This should be the same as the domain of your From address
+$mail->DKIM_domain = 'example.com';
+//Path to your private key file
+$mail->DKIM_private = 'dkim_private.pem';
+//Set this to your own selector
+$mail->DKIM_selector = 'phpmailer';
+//If your private key has a passphrase, set it here
+$mail->DKIM_passphrase = '';
+//The identity you're signing as - usually your From address
+$mail->DKIM_identity = $mail->From;
+
+//send the message, check for errors
+if (!$mail->send()) {
+    echo "Mailer Error: " . $mail->ErrorInfo;
+} else {
+    echo "Message sent!";
+}