British are obsessed with the post at Christmas. Cards to places like Australia and Canada can take a while via Royal Mail, so you have to make sure you “Post early for Christmas.” In England it is also expected that you give greeting cards to those they see every day. People can get genuinely upset if they are “off your Christmas card list” – which has become a phrase meaning that you no longer wish to associate with someone any more. The first year I resorted to email cards rather than one through the post I upset some very old friends. I have usually made my own Christmas cards and included a ’round robin’ (newsletter).
As well as cards there are parcels of presents to be posted to nieces, nephews, cousins, aunts and so on. Online Christmas shopping has made all that easier.