Hey, before I get socially engineered into attacking some forum, would you mind providing proof that the HN post is coming from the same person who owns the forum?
An announcement on the forum which requested spam would do nicely.
I have just checked out your forum and it does not seem to have any sort of form protection (stuff like hidden form inputs or captchas to solve). This tells me that it would be pretty easy to create some automated script to overload your backend. Well, unless your backend has specific checks or ways to prevent this.