Index: includes/mail.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/mail.inc,v
retrieving revision 1.7
diff -u -r1.7 mail.inc
--- includes/mail.inc	4 Sep 2007 21:10:45 -0000	1.7
+++ includes/mail.inc	11 Jan 2008 12:30:21 -0000
@@ -86,8 +86,8 @@
   // Bundle up the variables into a structured array for altering.
   $message = array(
     'id'       => $module .'_'. $key,
-    'to'       => $to,
-    'from'     => isset($from) ? $from : $default_from,
+    'to'       => strtolower($to),
+    'from'     => strtolower(isset($from) ? $from : $default_from),
     'language' => $language,
     'params'   => $params,
     'subject'  => '',