Click on the "fight spam here" link on the page
It brings you to a list of known spammer emails - with the links on this page generating another list of known spammer emails.. etc. etc.
There's no automatic way to get rid of spambots as they will always mimic valid users - fact.
You can manually block them as you have done (excellent list by the way - nice one mate) or you can try to deter them (i.e. spampoison).
Either way peeps
No need to dis the suggestion - absorb, accept or discard as you please.
It's all good either way.
Happy spam hunting