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Agent Spam - http://www.agentspam.com
Commercial spam / virus filtering services for corporations and ISP's.

Anti-Spam | Stop Spam Bots - http://www.safeemail.org/
Converts HTML code to hide email address from spam bots.

Anti-Spam tips and Resources for Webmasters - http://www.altruists.org/static/page.asp?id=168
Tips to publish email addresses on the web more safely. Includes a text-to-image converter and javascript encoders.

Avoid Spam - http://www.avoidspam.co.uk
Spam related news, articles, reviews, downloads and forums.

BestPrac.Org - http://www.bestprac.org/
Learn about best practices in spam prevention and eradication.

BlackSpider Technologies - http://www.blackspider.com
Provides spam filtering and virus protection for corporate customers.

Email address encoder - http://www.wbwip.com/wbw/emailencoder.html
Transforms ascii email addresses into their equivalent decimal entity through the use of Character Entities.

Email Address Encoder - http://w2.syronex.com/jmr/safemailto/
Offers simple and user challenge JavaScript based email encoder to prevent email harvesting.

Email Redirection Technique - http://www.aydef.com/how_to_stop_spam.htm
Step by step explanation of the email redirection technique to prevent spam from reaching to the end user.

Emailias - http://www.emailias.com/
A service that allows a person to generate new e-mail aliases to give to websites that want contact information.

Graphic @ for Spam Prevention - http://jamesthornton.com/software/graphic@.html
Prevent e-mail siphons from harvesting your e-mail address by not using the commercial "@" character when displaying your e-mail address on a Web page; use a graphical "@" instead. Examples in Perl, OpenACS, PHP, and ColdFusion.

How Do Spammers Get Email Addresses? - http://www.newcreations.net/webmaster/spam.html
Twelve ways spammers obtain email address. Includes links to websites explaining how to trace spammers down.

How do spammers harvest email addresses? - http://www.private.org.il/harvest.html
Several methods are described.

How to Block E-mail Relaying - http://members.tripod.com/martin_leese/EmailRelaying/
What to do when your computer is used to relay spam.

How to Stop Messenger Spam - http://www.re-quest.net/computers/messenger-spam/index.htm
Explains how to stop web pop-up spam advertising in Windows Messenger.

http://www.unspam.com/ - http://www.unspam.com/
A consulting company for businesses and governments promoting do-not-email registries. Includes spam news and articles.

MailVeil spam prevention - http://www.mailveil.com/
Offers a service to munge email addresses using flash to prevent harvesting.

MessageDefense, LLC - http://www.messagedefense.com
Offers services to businesses by acting as an agent between senders and recipients to prevent spam and other insecure email. Includes links to news on spam.

MessageLevel - http://www.messagelevel.com
The company that invented true Message Level Authentication for e-Mail. Provides an overview of the concept, product descriptions, how to get it for your organization and how to become a partner.

No Spam Email - http://www.venuemail.us/
Private email address with your own domain and unlimited aliases prevents spammers from obtaining real email address.

OptOutByDomain.com - http://www.optoutbydomain.com/
Universal opt-out by domain list; created as a "convenient opt-out" measure per the CAN-SPAM act.

Outlook Express Tutorial - http://www.webterrace.com/outlook/filter.htm
Step by step explanation with screenshots of how to set filters.

Paul Graham: Antispam - http://www.paulgraham.com/antispam.html
An intensive study essentially discussing spam-filtering techniques.

Personal Email Networks: An Effective Anti-Spam Tool - http://www.arxiv.org/abs/cond-mat/0402143
An automated graph theoretic method for identifying individual users' trusted networks of friends in cyberspace. [PDF/PostScript]

PHP Spam Poison (phpwpoison) - http://www.mariovaldez.net/software/phpwpoison/
An automated page generator that create long lists of fake email addresses to poison the spammer's database.

Redirect Mailto: For Spam Prevention - http://jamesthornton.com/software/redirect-mailto.html
Prevent e-mail siphons from harvesting your e-mail addresses by separating the address from the Web page while still providing a way for users to click a link and have it open their local mailer. Examples in Perl, OpenACS, PHP, and ColdFusion.

SEC Suspends Trading of 35 Companies Touted in Spam Email Campaigns - http://www.sec.gov/news/press/2007/2007-34.htm
Press release from the US Securities and Exchange Commission, explaining their recent actions to help curb stock tout spam.

Some Simple and Practical Means to Help Avoid Spam - http://w2.syronex.com/jmr/spam.html
Offers a few simple suggestions.

Spam Vampire - http://thescambaiter.com/antispam/
Aims to educate how spammers pay for bandwidth and how spam victims can fight back by endlessly loading their graphics to cost spammers money. Includes examples and customizable pages a victim can tailor to target specific spammers.

Spam-Proof Your Web Page - http://www.seafield-technologies.com/spam-proof/
Free service to encode the email addresses in your website so that they cannot be gathered by email robots.

Spam.org - http://www.spam.org/
Information about fighting and reducing spam. Links to major related sites and news.

Spambot Beware - http://www.turnstep.com/Spambot/
How to avoid, detect and harass spambots. Spambots are programs that extract email addresses from web pages, which are then used as targets for spam.

SpamMotel - http://www.spammotel.com/
Offering anti-spam program and disposable email addresses.

Stop Spam Email - http://homepage.ntlworld.com/nick.daws/
Offers advice under the categories of ISP filtering, services, software, sundries, hints and tips.

Stopping Spambots: A Spambot Trap - http://www.neilgunton.com/spambot_trap/
Neil Gunton describes his experiences with software programs browsing websites looking for email addresses, and the techniques he developed to stop them.

Sugarplum - http://www.devin.com/sugarplum/
Generates fake data to give to e-mail harvesting robots.

The Spammeister Guide to Spam - http://home.comcast.net/~spammeister/
FAQ on spam including ways to reduce the flow of junk email or become spam free.

Tim Williams: Anti-SpamBot Countermeasures - http://www.u.arizona.edu/~trw/spam/
Ciphers email addresses to foil spambots.

Why Am I Getting All This Spam? - http://www.cdt.org/speech/spam/030319spamreport.shtml
Report from the Center for Democracy and Technology analysing how email addresses posted on websites and in newsgroups attract spam, and how effective different obfuscation techniques are.

Wikipedia - CAPTCHA - http://en.wikipedia.org/wiki/CAPTCHA
Explains how captcha features can keep spammers from signing up for certain accounts online, such as email or weblogs. Explains how the system can be circumvented as well.

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