Index: workflow_ng/workflow_ng/modules/workflow_ng_system.inc
===================================================================
--- workflow_ng/workflow_ng/modules/workflow_ng_system.inc
+++ workflow_ng/workflow_ng/modules/workflow_ng_system.inc
@@ -242,8 +242,15 @@
     $$key = str_replace(array("\r", "\n"), '', $$key);
   }
   $to = isset($to) ? $to : $user->mail;
-
-  if (drupal_mail('workflow_ng_action_mail', $to, $subject, $message, $from)) {
+	
+	$content_type = ($settings['mime'] == 'html') ? 'html' : 'plain';
+	$headers = array(
+		'MIME-Version' => '1.0',
+		'Content-Type' => 'text/' . $content_type . '; charset=UTF-8; format=flowed',
+		'Content-Transfer-Encoding' => '8Bit',
+		'X-Mailer' => 'Drupal'
+		);
+  if (drupal_mail('workflow_ng_action_mail', $to, $subject, $message, $from, $headers)) {
     watchdog('action', t('Sent email to %recipient', array('%recipient' => ($to == $user->mail) ? $user->name : $to)), WATCHDOG_NOTICE, ($to == $user->mail) ? theme('username', $user) : NULL);
   }
   else {