Les timbres de Noël apportent toujours de la joie je trouve !quelle belle collection !
You're right, the release of each year's Christmas stamps are usually highly anticipated and they add that little bit extra joy to a Christmas card.
With the envelopes made of catalogues of stamps, I always think that the postal service will be confused. But it seems that I am the only that get confused!
I think the machines look for the phosphor tags on the stamps :)