The sound of sleigh bells or a jolly message from Father Christmas will greet anyone sending mail at the special postboxes in the coming weeks.
Four of them are being launched, in Edinburgh, London, Cardiff, and Belfast, installed with sensors which spark the messages. Simon Barker, operations director at Royal Mail, said: Delivering Christmas is our absolute priority this December.
Singing postbox delivers festive cheer in Cardiff | Wales
In the process, we enjoy any way we can add a little extra fun to posting Christmas cards this year.
Royal Mail is installing postboxes across the UK that will play traditional Christmas tunes when letters and cards are posted inside.
They will be decorated with snowflakes and equipped with sensors that are triggered when post drops inside, playing the sound of sleigh bells or a message from Father Christmas.
Launching this week, the postboxes will be in place throughout December. They will be located in Greenwich in London, Queen Street in Cardiff, Wellington Place in Belfast and High Street in Edinburgh.
The activation is being managed in-house, with TN Project Management assisting with the installation.