            foreach ($usr as $u) {
                # code...
                $msgs = str_replace('{{userid}}', $u->userid, $msg);
                $vars = array(
                            'to' => $u->email,
                            'to_name' => $u->userid,
                            'message' => $msgs,
                            'subject' => $subject,
                            'msgtype' => $_POST['type']
                        );
                $mailsend = Mail::send($vars);
                if($mailsend !== null){
                    $alermailsend[] = $mailsend;
                }
                sleep(3);
            }

The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.