I got hold of a pre-release copy of one of the server packages. While hacking around, I removed the restriction of only supporting selected newsgroups. Within a week of startup, the server had been discovered by transatlantic users, and more recent stats show european users are definitely a minority. Well, it provides a front for sending mail messages and posting news items anonymously. As you send your very first message to the server, it automatically allocates you an id of the form anNNN, and sends you a message containing the allocated id.
Any reply is of course anonymized in the same way, so the server provides a double-blind.
You will not know the true identity of any user, unless she chooses to reveal her identity explicitly. But if your signature starts with anything else, it's your own responsibility to remove it from your messages. There are two basic ways to use the system. But this really has to be a field in the message header, before the first empty line in the message. Ah yes, please remember that the posting takes place at my local site, so you can only post to groups that are received at penet.fi.