You are In control
It is the only spam blocker that puts you in control. You define exactly what level of protection you want, and what is spam and what isn't. You don't have to rely on some anonymous “spam cop” to censor your email. 

Immediately start blocking offensive and annoying 
junk email that clutters your inbox. With The Crab Trap filtering, you'll have access to easy-to-use custom filters that let you personalize them to meet your family's unique needs.

You will have your own, password-protected Message Center with an easy to use interface that allows you to adjust filter settings from lenient to aggressive, select the type of email you want blocked (Get Rich Quick, Sexually Explicit, Special Offers, and Racially Insensitive), and to “approve” or “block” specific senders or entire domains. This mail box is separate from your regular mail box. This is a special "Mail Center" that is set up for you, that will collect, and block 95% of the mail that makes you "crabby" and allow only the good mail to go into your regular box. 

Never a lost email
Suspicious email are quarantined in your web-based message center, and on a regular basis, you'll receive an email that summarizes the amount of messages quarantined in you private message center - a website where you can sort and review the detained email messages, as defined according to your personal filters. You will need to check this special mail center - 1 out of every 150 good emails may be put into your special box.

After using the service for some time, the filters intelligently adapt and become increasingly more accurate - up to 95% accurate!! 
Here is what it looks like!