diff --git a/mimemail.module b/mimemail.module
index 110323f..4b753f0 100644
--- a/mimemail.module
+++ b/mimemail.module
@@ -307,6 +307,7 @@ function mimemail_prepare_message($message) {
   $from = $message['from'];
   $subject = $message['subject'];
   $body = $message['body'];
+  $params = $message['params'];
 
   $headers = isset($message['params']['headers']) ? $message['params']['headers'] : array();
   $plain = isset($message['params']['plain']) ? $message['params']['plain'] : NULL;
@@ -348,7 +349,7 @@ function mimemail_prepare_message($message) {
   $subject = str_replace(array(" \n", "\n"), '', trim(drupal_html_to_text($subject)));
   $key = str_replace('_', '-', $key);
   $hook = array('mimemail_message__' . $key, 'mimemail_message');
-  $variables = array('key' => $key, 'recipient' => $to, 'subject' => $subject, 'body' => $body);
+  $variables = array('key' => $key, 'recipient' => $to, 'subject' => $subject, 'body' => $body, 'params' => $params);
   $body = theme($hook, $variables);
 
   foreach (module_implements('mail_post_process') as $module) {
diff --git a/theme/mimemail-message.tpl.php b/theme/mimemail-message.tpl.php
index 109c384..b2b4fd1 100644
--- a/theme/mimemail-message.tpl.php
+++ b/theme/mimemail-message.tpl.php
@@ -14,6 +14,7 @@
  * - $body: The message body
  * - $css: Internal style sheets
  * - $key: The message identifier
+ * - $params: The message params
  *
  * @see template_preprocess_mimemail_message()
  */
diff --git a/theme/mimemail.theme.inc b/theme/mimemail.theme.inc
index fbcf0c4..7f17607 100644
--- a/theme/mimemail.theme.inc
+++ b/theme/mimemail.theme.inc
@@ -10,7 +10,7 @@ function mimemail_theme_theme() {
 
   return array(
     'mimemail_message' => array(
-      'variables' => array('key' => NULL, 'recipient' => NULL, 'subject' => NULL, 'body' => NULL),
+      'variables' => array('key' => NULL, 'recipient' => NULL, 'subject' => NULL, 'body' => NULL, 'params' => array()),
       'template' => 'mimemail-message',
       'pattern' => 'mimemail_message__',
       'file' => 'mimemail.theme.inc',
@@ -28,6 +28,7 @@ function mimemail_theme_theme() {
  * - $key:  The mailkey associated with the message
  * - $subject: The message subject
  * - $body:  The message body
+ * - $params: The message params
  *
  * @see mimemail-message.tpl.php
  */