That's indeed what it is.
If you don't get the email, check your spam box. If you don't have it, check that you can send emails with Joomla (from the mass mail component for example). If you don't receive the emails, it's likely that the email configuration of the joomla configuration page is not correct. You should ask your hosting company about what you should put there.
If you receive them, it's likely that the email configuration of the hikashop configuration page is not correct. You should ask your hosting company about what you should put there. Usually, it comes from either the charset encoding, or the "add names" option.