I received recently an advert mail about the realease of a new version of the DivX software. Not very philatelic, but on the upper banner, it showed this image :
A cancelled stamp with (as we say in France) a advert "flamme" on the corner of a brown cover. The imitated stamp respects the conventions : place for value, name of country and a legend on the bottom. If e-mail and SMS win the market of communications between people, it seems that good old paper mail always marks the imaginery.