I use two types of spam filters.
First, I use SpamAssassin on my servers. So, anyone that Im hosting (including myself!) that gets email through it has that installed on their account when it is set up. SpamAssassin is really nice because it has a way for each user to adjust his or her own filter level.
Every email gets a negative or positive score through a battery of checks when it lands on the server. The higher the score, the more likely it is spam. The idea is to catch all the and leave you with only (good email). Customizable spam filtering makes this possible for each person.
For instance, if you wrote an email that had the word in it, that might be a -1. Blind carboning or carboning a lot of recipients might be -2. Writing a long paragraph about something might give you a +1. There are plenty of other checks SpamAssassin does on the hidden information in your email too. So, when it is all said and done, a particular email might get a score of 5. If Spam Assassin is set for 4, you wont ever see it. If you have Spam Assassin set for 6, it will show up in your inbox.
I have had clients go from 100s of spams a day to practically none. They were scared their email wasnt working until they realized they were only getting emails they wanted. 
Its a great product.

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