[rbgrn]

That was full of bugs. I forgot to specify the forum in the query. Oops. Here's the updated code

            // hide email addresses
            $mailmessage = preg_replace("/[a-zA-Z0-9\-_]+@[a-zA-Z0-9\-_]+.[a-z]{2,4}/", 'xxx@xxx.xxx', $mailmessage);

            // find thread with matching title 'Post'
            // make reply if match
            $baseTitle = preg_replace("/re: /", "", $title);
            $baseTitle = preg_replace("/Re: /", "", $baseTitle);
            $baseTitle = preg_replace("/RE: /", "", $baseTitle);
            $forumid = $foruminfo['forumid'];
            $queryResult = $vbulletin->db->query_first("
                SELECT threadid
                FROM " . TABLE_PREFIX . "thread
                WHERE forumid = $forumid AND (title = '$title' OR title = '$baseTitle') ORDER BY threadid DESC LIMIT 1
            ");
            if ($queryResult['threadid']) {
                $threadid = $queryResult['threadid'];
                $type = "reply";
                $cronlog .= "Found reply for thread $threadid";
            }
            // ##### Time To Post The Reply #####
            if ($type == "reply")
            {
                // Building post info