Spam+Filer

= Spam Filters = toc Spam Filters are programs designed to keep unwanted mail out of a users email in-box. These programs come in different forms from a variety of sources. There main function is to sift through incoming email to determine which are unsolicited or unwanted and which are legitimate. These are similar in function to internet filters, as seen on this wiki page.

Methods of Spam Filtration
Taken from: ClearMyMail
 * Challenge-Response
 * This system limits incoming email to approved addresses. When mail arrives from a new address permission must be given by the email user to accept the message. Messages from sources that are not approved are labeled spam.
 * Rules based spam filter
 * Block email based on user set of terms and conditions. This is the original spam filtering method.
 * Global Black List
 * Lists of well know spammers. This method needs to be used in combination with others since it relies on the spammers to be well known.
 * Bayesian Analysis
 * Uses mathematical formulas to determine if a message is spam. This method requires constant updating by the user. As the user labels emails as spam the system learns and adjusts its formulas.

Examples of types of spam filters

 * Challenge-Response: KnockKnok, ChoiceMail, Steven, PostShield
 * Rules based spam filter: Rules are set by users in email system
 * Global Black List: spamhaus.org, uceprotect.net
 * Bayesian Analysis: Cactus Spam Filter, Death2Spam, Eudora

**References**
ClearMyMail Limited. (2008). //Spam Filter Types//. Retrieved November 15, 2011, from ClearMyMail: http://www.clearmymail.com/guides/spam_filter_types.aspx#rules

Spamhaus Project Ltd. (2011). //Spamhsus//. Retrieved November 15, 2011, from Spamhaus: @http://www.spamhaus.org/

UCEPROTECT-Orga. (2011). //UCEPROTECT Network//. Retrieved Novmeber 15, 2011, from UCEPROTECT: h@ttp://www.uceprotect.net/en/index.php