Index: wp-admin/user-new.php
===================================================================
--- wp-admin/user-new.php	(revision 18519)
+++ wp-admin/user-new.php	(working copy)
@@ -59,7 +59,7 @@
 		wp_die(__('Cheatin’ uh?'));
 
 	// Adding an existing user to this blog
-	$new_user_email = esc_html(trim($_REQUEST['email']));
+	$new_user_email = $user_details->user_email;
 	$redirect = 'user-new.php';
 	$username = $user_details->user_login;
 	$user_id = $user_details->ID;