Addresses please?

So I'm about to start the annual Christmas card tradition, and it strikes me, yet again that I don't necessarily have accurate address information for everyone to whom I want to write. Indeed, a number of people have moved into new abodes, some in new cities, provinces, states and countries. Others, I have no idea whether they've moved or are in the same place as ever. Regardless, I really want cards to be received by the appropriate recipients rather than being returned to me, the sender, yet again. [every year a certain number, less than 10 but still a significant amount, arrive back at my home, unopened] So if your details have changed (or even if they haven't but you're interested in receiving a card), could I please get an email or personal message from you?
Thanks a bundle as always.