I don't think you need to limit countries, maybe just set a mail by date. Maybe a week or two before Christmas?

At the end of the day, we're all doing it to have fun. No one is going to hold it against people if gifts take longer. It's the time of year, and mail delays are expected.
I believe in manicures. I believe in overdressing. I believe in primping at leisure and wearing lipstick. I believe in pink. I believe that laughing is the best calorie burner. I believe in kissing, kissing a lot. I believe in being strong when everything seems to be going wrong. I believe that happy girls are the prettiest girls. I believe that tomorrow is another day and I believe in miracles.
Audrey Hepburn