In mid-90s, at the same time I discovered the existence of IYS-International Youth Service, I also got to know about Poste Européenne de l'Amitié (or European Post of Friendship), working under the patronage of the European Community (European Union nowadays).
Poste Européenne de l'Amitié was created in 1975 by a group of voluntary workers. Since then, it has favoured the correspondence exchange among more than 200000 French young people and from other European nationalities (13 to 20 years of age). This service was free of charge because as they state Friendship is a richness which cannot be commercialized:
POSTE EUROPÉENNE DE L'AMITIÉ
c/o MAISON DE L'EUROPE
37, Rue des Francs-Bourgeois
Back then, I got one pal through Poste Européenne de l'Amitié and my brother got two pals as well. Therefore, this association was working well back to the 90s. I have tried to search about them on the Internet and I found the website of the Maison de l'Europe de Paris-House of Europe in Paris and the site of the Federation of Houses of Europe.
However, I couldn't find anything about their current activity and if they are still involved in the correspondence exchange for young people. If someone out there, especially French people, do know something about Poste Européenne de l'Amitié, let me know the news you have about them and if they are still active at present.