public function addMergeVar($recipient, $name, $content)
    {
        $this->mergeVars[] = array(
            'rcpt' => $recipient,
            'vars' => array(
                array(
                    'name' => $name,
                    'content' => $content
                )
            )
        );

        $this->setMerge(true);

        return $this;
    }