[fairytale]

What kind of spam do you refer to exactly?

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.

[codingclaws]

You are correct, all forms have zero protection/throttling. Do as you please.