Fix issue where on_hold email addresses are not being filtered out of

recipient list for mailings.

CRM/Mailing/BAO/Mailing.php

@@ -249,6 +249,7 @@ public static function getRecipients($mailingID) {
         $location_filter,
         "$entityTable.email IS NOT NULL",
         "$entityTable.email != ''",
+        "$entityTable.on_hold = 0",
         "mg.mailing_id = #mailingID",
         'temp.contact_id IS NULL',
       );