The Royal Mail is launching "singing" postboxes which play Christmas jingles when cards and letters are posted.
The sound of sleigh bells or a jolly message from Father Christmas, triggered by a motion sensor, will greet anyone sending mail at the special postboxes in the coming weeks.
Four of them are being launched, in London, Cardiff, Belfast and Edinburgh, installed with sensors which spark the messages.
Simon Barker, operations director at Royal Mail, said: "Delivering Christmas is our absolute priority this December.
"In the process, we enjoy any way we can add a little extra fun to posting Christmas cards this year.”
The postboxes are adorned with snowflakes and will be in place throughout the festive season.