After 2 years we are binning it.
Aus post can't & wont do anything, they just tell you to write return to sender & no longer at this address on it.
We also tried calling the companies that sent the mail. Westpac only stopped sending it because we said if a credit card turned up we would use it & claim it might have been ours because we have another account with them & not have read the name on it(not that we would have). Vodaphone still send their mail because of "privacy issues", even though it's a mobile phone (a number that they have on their records) they wont ring them & tell them to change their address.
The local police said send it back for 12 months, any longer than that just throw it out. If any electoral stuff turns up, you can ring the electoral comission & have them unenrolled