Folded card sent by Laura (the UK).
Postcard sent by Heleen (the Netherlands). She wrote that in fact the postcard didn't announce any change of address. But I received it in the final of the summer, when I was coming back after six weeks abroad. So maybe it was more correct that the sender herself has thought!
This is a rubber stamp on the back of a postcard sent by Postmuse (USA). And the following green one, a bewhiskered (!?) snail on the back of a postcard sent by John (UK).