I was on holiday in Egypt about 3 weeks ago, and during my time there I posted 6 postcards to my friends and family. None of which have arrived. Is Egyptian postage usually this slow?
occasionally, yes. It's possible they may never arrive. The third world is like that sometimes. But they may just be in a train chugging round the outskirts of Cairo in search of a sorting office.
Something I do now when I go abroad is write out envelopes to those I send postcards to and pop the postcard in the envelope when on holiday. Letters seem to get to their destination whereas postcards don't!