to Ukraine and the stamp comes off? what if I put a stamp on a letter/greeting card that's going to Ukraine and the stamp comes off? I mailed it on Saturday,January 22.2011. If the stamp comes off,how long should it take to return to me? (That was 5 days ago).Also,I put a $0.70 stamp and a $0.28 stamp on a greeting card going to Poland and the post office postmarked it. What if those stamps come off? It seems it should still get there since it's just a greeting card,it shouldn't have to go through customs!