Index: wp-mail.php
===================================================================
--- wp-mail.php	(revision 38134)
+++ wp-mail.php	(working copy)
@@ -12,7 +12,7 @@
 
 /** This filter is documented in wp-admin/options.php */
 if ( ! apply_filters( 'enable_post_by_email_configuration', true ) )
-	wp_die( __( 'This action has been disabled by the administrator.' ) );
+	wp_die( __( 'This action has been disabled by the administrator.' ), 403 );
 
 /**
  * Fires to allow a plugin to do a complete takeover of Post by Email.