public function email($email)
    {
        if (! is_string($email) && ! is_array($email)) {
            throw new InvalidArgumentException('The email can be only string or array');
        }

        $this->emailTo = is_array($email) ? $email : [$email];

        // Force the job to run in foreground
        $this->inForeground();

        return $this;
    }