Hamilton Road, High Wycombe, Buckinghamshire, UK and Hamilton Road, High Wycombe, Perth, Western Australia.
For almost a decade Margaret Froggatt, of Selly Oak, has been sending letters and cards to her family in Australia, only to have them delivered to Buckinghamshire.
A lady called Shirley who receives Margaret's letters forwards them onto Australia and has formed a friendship with Shirley over the last eight years.
The first time it happened was when a birthday card to grandson Sean got lost eight years ago.
It is not just birthday cards that have gone astray. When Margaret's cousin, Shirley, who also lived in Australia, passed away recently. Margaret's tribute wasn't read out at the funeral and didn't make it into the condolence book, because it got lost in the post.
Husband Roy wrote directly to Royal Mail bosses about the problem two years ago and ended up with a letter of apology and £50 compensation.
In a statement Royal Mail said: