Go to your options menu in emule then hit the security tab.
There you'll find the option to filter messages.
Here's a bit of mine for example:
Your client has an infinite queue|Your client is connecting too fast|fastest download speed|disrael|zambor|zambor 2|FXeMule
Works for me so far
Cheers
(P.s. Put the names of the "spammers" between the seperators but that's obvious i guess)
