I have been using Spamihilator for the last two years and can only say that this is the best free anti spam software that I ever used. And believe me, I tried a lot. Before i used the software I received approximately 500 spam mails per day, mainly due to published emails on websites that I own.
I searched desperately for a good anti spam software and tried many. Most did not work to well in reducing spam, some worked to well and even stopped my normal mail from arriving. Then, finally after a long evaluation time I found the spam software that I´am still using today. It reduced my daily spam dosis of 500 to 4 in just two days.