Postcards were always a family tradition with us, and it was fun receiving in the mail pictures of places people were visiting. I had not really noticed but you are right - they pretty much have died out. Admittedly I don't send them because I hardly ever go anywhere - but all I get in the post now are bills and junk mail. And junk mail bills.
Of course the best way to share your holiday snaps nowadays is to put them in your Steem Blockchain based blog - and e-mail the post link to everyone you know!
Very good advice C0ff33e. I will do that this year! It will be my Christmas Spam Post.