As I said already, this does not exist in my country.
I sent an ordinary letter and don’t know who to contact and as I said, this does not exist for an ordinary letter.
The example that you show me is not for a letter but for a package, that is not the same.
The post does not work very well in Belgium and when you have to contact someone to get information it is horrible BUT I sent the letter and you should receive it.
I regularly send letters for the children that I help in Thailand and they alsways receive them.
In case of need I will send it again.