One of the web-only paper I'm subscribed to require an actual letter, with an "Avis de réception", that requires you to go to the post office to get the proper,

One of the web-only paper I'm subscribed to require an actual letter, with an "Avis de réception", that requires you to go to the post office to get the proper, special envelope, like it's the XIXth century all over again. For a web-only publication, that's quite rich.