How to send people on your disallowed comment list to the spam bin, and live better.
Quack. Quack. Quack.
The bottom line is that if it looks too good to be true, it is. No probably about it.
Stopping spam a little more inventively than just saying "If there are 100 recipients, these are bad..."
Protecting yourself from abuse and harassment in comment forms seems to be a white whale.