[throwaway2037]

    In some countries you can't even receive some types of registered mail unless it is addressed exactly to where you are staying at that moment.

This makes good sense to me in countries where you need to register you home address with the local govt. Then registered mail delivery becomes a form of ID check. This is normal in Japan and other places.

[someplaceguy]

But the point is that it makes it hard or impossible to receive that type of mail if you travel frequently...