I'm generally in favor of anonymity, but if not that, then I like [2].
I certainly see no reason to reveal [1]. For one thing, you will just
invite forged mail, mail through anonymous relays, and so on. As far
as revealing [3], well, [3] is just an alias for [1].
Perhaps posts should normally be attributed by [2], but if the player
is willing to forgo his 50 gold, the post can be made anonymous.
Or make all posts anonymous, but give players an option to bribe a
clerk at the Times office to find out who posted a particular article.
-- Scott T.