See changelog.

PHPMailerAutoload.php

@@ -0,0 +1,33 @@
+<?php
+/**
+ * PHPMailer - PHP email creation and transport class
+ * PHP Version 5.0.0
+ * @package PHPMailer
+ * @link https://github.com/PHPMailer/PHPMailer/
+ * @author Marcus Bointon (coolbru) phpmailer@synchromedia.co.uk
+ * @author Jim Jagielski (jimjag) jimjag@gmail.com
+ * @author Andy Prevost (codeworxtech) codeworxtech@users.sourceforge.net
+ * @author Brent R. Matzelle (original founder)
+ * @copyright 2013 Marcus Bointon
+ * @copyright 2010 - 2012 Jim Jagielski
+ * @copyright 2004 - 2009 Andy Prevost
+ * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
+ * @note This program is distributed in the hope that it will be useful - WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/**
+ * Define an SPL autoloader for PHPMailer classes
+ * @param string The name of the class to load
+ */
+function PHPMailerAutoload($classname)
+{
+    //Can't use __DIR__ as it's only in PHP 5.3+
+    $filename = dirname(__FILE__).DIRECTORY_SEPARATOR.'class.'.strtolower($classname).'.php';
+    if (is_readable($filename)) {
+        require $filename;
+    }
+}
+
+spl_autoload_register('PHPMailerAutoload');

changelog.md

@@ -32,6 +32,9 @@
 * Add unit tests for DKIM
 * Major refactor of SMTP class
 * Reformat to PSR-2 coding standard
+* Introduce autoloader
+* Allow overriding of SMTP class
+* Overhaul of PHPDocs
 
 ## Version 5.2.6 (April 11th 2013)
 * Reflect move to PHPMailer GitHub organisation at https://github.com/PHPMailer/PHPMailer