public function replaceExtraTag($tag, $value)
    {
        $this->subject = str_replace('{' . $tag . '}', $value, $this->subject);
        $this->user_subject = str_replace('{' . $tag . '}', $value, $this->user_subject);
        $this->text = str_replace('{' . $tag . '}', $value, $this->text);
        $this->user_text = str_replace('{' . $tag . '}', $value, $this->user_text);
    }