Free based anti spam software for windows

Blue Frog is the client software of Blue Securitys Do Not Intrude Registry anti-spam service. Blue Frog empowers you to actively fight spam with the members of the Blue Community in a safe and automated manner.
Blue Security will analyze spam reported by Blue Community members and reports sites advertised by spam to the ISPs hosting them, to government agencies and to other anti-spam groups.
Additionally, Blue Frog clients installed on the machines of Blue Community members automatically post complaints at Web sites advertised by the spam they receive -- the total number of complaints equals the number of spam messages received.
To avoid receiving further complaints, spammers should download a set of tools that clean their mailing lists from addresses of community members and stop sending them spam.
Blue Frog runs in the background without requiring your intervention and without disturbing you or your work. Blue Frog is a visible source project ensuring it is safe to use.
You may register the e-mail addresses where you wish to stop receiving spam in the Do Not Intrude Registry. You may also register your entire e-mail domain.
Download Blue Frog and join the members of the Blue Community in their fight against spam. Over 400,000 email addresses protected.

a-squared Anti-Spam is a desktop anti spam solution designed for personal users who are not able to use server side spam filtering or dont trust the spam filter of their internet service provider.
a-squared Anti-Spam was designed for Outlook Express 6 and MS Outlook XP/2003, but any other e-mail clients can be used too.

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The SpamBayes project is working on developing a Bayesian anti-spam filter, initially based on the work of Paul Graham. The major difference between this and other, similar projects is the emphasis on testing newer approaches to scoring messages. While most anti-spam projects are still working with the original graham algorithm, we found that a number of alternate methods yielded a more useful response.
SpamBayes is not a single application.
The core code is a message classifier, however there are several applications available as part of the SpamBayes project which use the classifier in specific contexts. For the most part, the current crop of applications all operate on the client side of things, however, a number of people have experimented with using SpamBayes on mail servers to classify incoming mail for multiple users. The table below outlines the main applications which are part of the SpamBayes distribution.
SpamBayes will attempt to classify incoming email messages as spam, ham (good, non-spam email) or unsure. This means you can have spam or unsure messages automatically filed away in a different mail folder, where it wont interrupt your email reading. First SpamBayes must be trained by each user to identify spam and ham. Essentially, you show SpamBayes a pile of email that you like (ham) and a pile you dont like (spam). SpamBayes will then analyze the piles for clues as to what makes the spam and ham different. For example: differences in the mail headers, different words and content style. The system then uses these clues to examine new messages.
For instance, the word "Nigeria" appears often in spam, so you could use a spam filter which identifies anything with that word in it as spam. But what if your business involves writing a guidebook on Nigerian Wildlife Conservation? Clearly a more flexible approach is necessary. Additionally spammers will adapt their content over time and will no longer use the word "Nigeria" (or the words "Lose Weight Fast", or any number of other common lines). Ideally the software will be able to adapt as the spam changes.
So, that is what SpamBayes does. It compares the spam and the ham and calculates probabilities. For instance, for me, the word "weight" almost never occurs in legitimate email, but it occurs all the time in lose weight fast spam. SpamBayes can then look at incoming email, extract the most significant clues and combine the probabilities to produce an overall rating of "spamminess". It flags the messages so that your mailer can handle the different message types. You might set it up so that ham goes straight through untouched, spam goes to a folder that you ignore (or delete without checking) and the unsure messages go to another folder which you can review for errors.
This version does not work with Outlook Express, but there is a version that does. For more information click here

Eliminate Junk E-Mail Spam, Viruses, Tojans & Spyware. Works with POP3 & IMAP. Spam Nullifier FREE Anti Spam Filter is a powerful e-mail checker programs with effective spam elimination. Discover the safe way to stop unwanted viruses & spam e-mails before they get to your computer. Can even be used as an effective privacy tool. You will find this to be the easiest, most effective way to manage your incoming e-mails like a pro in seconds. SpamNullifier is the best solution to fight the spam mails in your e-mail accounts. Filters the messages using a multiple criteria like spam words, friend list, blocked list, and state of the art algorithm rules. Your account passwords are encrypted by a powerful encryption technique, so its too difficult for any one to hack to obtain your passwords. All messages text whatever deleted or resident in the mailbox are saved in your hard drive and appears in the main window list, the reason for deletion or existence and other checking information are also stated, of course you can delete any message from the history to save your hard drive space. Log file for any checking action can be written. Supports POP3 & IMAP servers, HTTP servers like Yahoo! and Hotmial will be supported in the PRO version.