As per Radio Prague, due to significant price hikes by the Czech postal service have forced them to make a few changes. From 2024, Radio Pragie will only Send printed postcards to listeners who send a printed postcard or letter themselves. Otherwise, Radio Prague will send digital QSL cards to those who send a message by email or via web form.

Details at :

 
Radio Prague's 2024 QSL card series will be musical – and digital

https://english.radio.cz/radio-pragues-2024-qsl-card-series-will-be-musical-and-digital-8804225