diff --git a/system/libraries/Email.php b/system/libraries/Email.php
index 4586679..9391d82 100644
--- a/system/libraries/Email.php
+++ b/system/libraries/Email.php
@@ -1816,98 +1816,23 @@
 	 */
 	protected function _mime_types($ext = '')
 	{
-		$mimes = array(
-						'hqx'	=>	'application/mac-binhex40',
-						'cpt'	=>	'application/mac-compactpro',
-						'doc'	=>	'application/msword',
-						'bin'	=>	'application/macbinary',
-						'dms'	=>	'application/octet-stream',
-						'lha'	=>	'application/octet-stream',
-						'lzh'	=>	'application/octet-stream',
-						'exe'	=>	'application/octet-stream',
-						'class'	=>	'application/octet-stream',
-						'psd'	=>	'application/octet-stream',
-						'so'	=>	'application/octet-stream',
-						'sea'	=>	'application/octet-stream',
-						'dll'	=>	'application/octet-stream',
-						'oda'	=>	'application/oda',
-						'pdf'	=>	'application/pdf',
-						'ai'	=>	'application/postscript',
-						'eps'	=>	'application/postscript',
-						'ps'	=>	'application/postscript',
-						'smi'	=>	'application/smil',
-						'smil'	=>	'application/smil',
-						'mif'	=>	'application/vnd.mif',
-						'xls'	=>	'application/vnd.ms-excel',
-						'ppt'	=>	'application/vnd.ms-powerpoint',
-						'wbxml'	=>	'application/vnd.wap.wbxml',
-						'wmlc'	=>	'application/vnd.wap.wmlc',
-						'dcr'	=>	'application/x-director',
-						'dir'	=>	'application/x-director',
-						'dxr'	=>	'application/x-director',
-						'dvi'	=>	'application/x-dvi',
-						'gtar'	=>	'application/x-gtar',
-						'php'	=>	'application/x-httpd-php',
-						'php4'	=>	'application/x-httpd-php',
-						'php3'	=>	'application/x-httpd-php',
-						'phtml'	=>	'application/x-httpd-php',
-						'phps'	=>	'application/x-httpd-php-source',
-						'js'	=>	'application/x-javascript',
-						'swf'	=>	'application/x-shockwave-flash',
-						'sit'	=>	'application/x-stuffit',
-						'tar'	=>	'application/x-tar',
-						'tgz'	=>	'application/x-tar',
-						'xhtml'	=>	'application/xhtml+xml',
-						'xht'	=>	'application/xhtml+xml',
-						'zip'	=>	'application/zip',
-						'mid'	=>	'audio/midi',
-						'midi'	=>	'audio/midi',
-						'mpga'	=>	'audio/mpeg',
-						'mp2'	=>	'audio/mpeg',
-						'mp3'	=>	'audio/mpeg',
-						'aif'	=>	'audio/x-aiff',
-						'aiff'	=>	'audio/x-aiff',
-						'aifc'	=>	'audio/x-aiff',
-						'ram'	=>	'audio/x-pn-realaudio',
-						'rm'	=>	'audio/x-pn-realaudio',
-						'rpm'	=>	'audio/x-pn-realaudio-plugin',
-						'ra'	=>	'audio/x-realaudio',
-						'rv'	=>	'video/vnd.rn-realvideo',
-						'wav'	=>	'audio/x-wav',
-						'bmp'	=>	'image/bmp',
-						'gif'	=>	'image/gif',
-						'jpeg'	=>	'image/jpeg',
-						'jpg'	=>	'image/jpeg',
-						'jpe'	=>	'image/jpeg',
-						'png'	=>	'image/png',
-						'tiff'	=>	'image/tiff',
-						'tif'	=>	'image/tiff',
-						'css'	=>	'text/css',
-						'ics'	=>	'text/calendar',
-						'html'	=>	'text/html',
-						'htm'	=>	'text/html',
-						'shtml'	=>	'text/html',
-						'txt'	=>	'text/plain',
-						'text'	=>	'text/plain',
-						'log'	=>	'text/plain',
-						'rtx'	=>	'text/richtext',
-						'rtf'	=>	'text/rtf',
-						'xml'	=>	'text/xml',
-						'xsl'	=>	'text/xml',
-						'mpeg'	=>	'video/mpeg',
-						'mpg'	=>	'video/mpeg',
-						'mpe'	=>	'video/mpeg',
-						'qt'	=>	'video/quicktime',
-						'mov'	=>	'video/quicktime',
-						'avi'	=>	'video/x-msvideo',
-						'movie'	=>	'video/x-sgi-movie',
-						'doc'	=>	'application/msword',
-						'word'	=>	'application/msword',
-						'xl'	=>	'application/excel',
-						'eml'	=>	'message/rfc822'
-					);
+		static $mimes;
 
-		return isset($mimes[strtolower($ext)]) ? $mimes[strtolower($ext)] : 'application/x-unknown-content-type';
+		$ext = strtolower($ext);
+
+		if ( ! is_array($mimes))
+		{
+			$mimes =& get_mimes();
+		}
+
+		if (isset($mimes[$ext]))
+		{
+			return is_array($mimes[$ext])
+				? current($mimes[$ext])
+				: $mimes[$ext];
+		}
+
+		return 'application/x-unknown-content-type';
 	}
 
 }