In Australia it is not free to onforward Mail.
We onforward mail by applying at the Post Office.
We fill out a form and pay a cost that applies to the term we choose.
I just moved to the country and took 6 months. ($40 IIRC)
My postmater or sorter, then applies a computer generated sticker to all my
mail, and it gets passed on.
I recently was fined $100 for not renewing my vehicle licence and handing
in the registration plates, I appealed and used my Post Office redirection
application and payment as proof.
I won (today) and the fine was withdrawn.

The "mail back" confirmation from Australia Post
( A similar route used by email confirmation of a service request)

Australia Post Redirection paper showing costs.............
