- Abaca Technology
 - Maker of the Email Protection Gateway appliance, designed to filter spam, block viruses, and protect email. - ABS Computer Technology
- Provides security auditing, vulnerabilities scans, and remediation as well as spam and virus filtering using Active Defence.
- AllSpamAway
- Offers anti-spam software for use with Microsoft Outlook.
- AllSpamGone
- Permission-based anti-spam software that does not rely on filters or message rules.
 Ambleton Computing
- Specialises in business critical anti virus software and spam protection, as well as network and Internet security and professional web development.- Anti-Spam-Software.com
- Offers spam and junk email filtering solutions for home and corporate use.
- Atqui Spam Filter
- Mail server that blocks unwanted electronic messages from being downloaded to your computer.
- Block All Spam, Inc.
- Offers spam free, web-based email to consumers and technology licenses to email server manufacturers.
- Blue Security
- Develops innovative solutions to spam and spyware based on their Do-Not-Disturb Registry approach.
- CipherTrust
- Enterprise email security including anti-spam and webmail protection.
- Cloudmark SpamNet
- Offers a peer-to-peer collaborative spam reporting network to automatically stop spam.
- DigiPortal Software Inc.
- Makers of Choicemail, a permission-based approach to blocking spam, as well as the applications OmniViewer and NewsFocus.
- EmailFiltering.co.uk
- Subscription service that helps stop virus and spam emails.
- GFI Mail Essentials
- Server-based antispam software for email servers.
- Goodbye Spam
- Designed to work with both pop3 and web-based accounts.
- Habeas
- User-based service in which the system identifies for you which email is not spam, and gives you the email you want.
- Katharion
- Provides anti-spam and anti-virus software solutions for businesses, ISPs, and resellers.
- Mail Zapper
- Automatically checks and notifies you of spam email before you download it.
- Mailexpire
- Allows users to keep their inboxes free of spam by creating a free email alias.
- MailFrontier, Inc.
- Developers of the Matador junk email client.
- Mailshell SpamCatcher
- Offers anti-spam filtering technology bundled in an integrated and flexible mail server and email client suite for business and personal use.
- Mailshell.com
- Offers mail samples before subscribing.
- MailShield
- Your existing mail server can reject spam, stop mail bombs and refuse unauthorized mail relaying.
- MailWasher
- Alerts, deletes, and bounces unwanted emails. Also prevents spam and viruses with heuristic checking.
- My Spam Bin
- Anti-spam solution for businesses of all sizes. My Spam Bin is designed to stop unwanted emails and viruses before they reach your company.
- PC Tools
- Makers of Spyware Doctor, a spyware removal utility and Spam Monitor for email filtering.
- Polesoft
- Specialises in developing safe, anti-spam software for personal users and enterprises including Lockspam, filtering software for Microsoft Outlook.
- Postini
- Protects corporate networks and service providers from spam.
- Project Honey Pot
- Distributed system for identifying spammers and the spambots they use to scrape addresses from your website.
- Qurb
- Desktop software that integrates with Microsoft Outlook to filter out unwanted junk mail, unwanted offers, and offensive content.
- RoadBlock
- Stops unsolicited spam email before it reaches your desktop.
- Senders Permitted From (SPF)
- Closes the loopholes that make standard SMTP email anonymous and forgeable.
- Sneakemail
- Offers disposable email addresses to protect against spam.
- Spam Arrest
- Subscription-based spam blocking service for Microsoft Outlook and Eudora Mail.
- Spam Bully
- Spam filtering and blocking software for Outlook and Outlook Express that bounces messages back to spammers, featuring a multi-language interface and graphical statistics.
- Spam Filter & Spam Blocker Systems
- Provides a comparison of the advantages and disadvantages of using spam filtering and blocking systems.
- Spam Inspector
- Producers of the SPAM INSPECTOR line of products designed to filter unwanted mail messages and unsolicited commercial email from the primary email clients and tools available today.
- Spam Monitor
- Anti-spam software that detects, filters, and isolates unsolicited junk email supporting popular mail clients including Outlook and Outlook Express.
- Spam Reader
- Anti-spam add-on for MS Outlook based on a Bayesian algorithm. Spam Reader supports POP3, Exchange, and IMAP accounts and works with Outlook 2000, XP, 2003, and 2007.
- Spam Rejection Service
- Provides an anti-spam filtering service.
- SpamAid
- MS Outlook add-on to protect your inbox against spam using Bayesian filtering technology. SpamAid features an auto-learning ability, storing quarantined emails in a separate spam folder. POP3, IMAP, HTTP, and MS Exchange are supported.
- SpamAssassin
- Mail filter to identify spam.
- Spambam
- Acts as a POP3 and SMTP Proxy for your mail client.
- Spambot
- Stops robots from collecting you email from a web page.
- SpamBouncer
- Is a set of procmail recipes, or instructions, which search the headers and text of your incoming email to determine if it is spam.
- SPAMfighter
- Spam and phishing filter for Outlook and Outlook Express. Download the free version or purchase SPAMfighter Pro.
- SpamFilter ISP
- Anti-spam gateway for SMTP servers featuring statistical bayesian DNA fingerprinting along with the application of dozens of blacklist and white rules.
- SpamKiller
- Offers software and a suite of software and Web-based security application services including spam blocking, firewall, anti virus, privacy, and recovery.
- SpamSift
- Removes spam and viruses from existing e-mail accounts without the need to download or install any software.
- SpamTrap
- POP3 Internet mail spam filtering service requiring no software.
- SpamWeed
- Blocks junk email before it can reach a user's inbox. Suitable for both corporate and home use. Supports all POP3 email clients.
- Symantec Brightmail
- Blocks spam for corporate customers and service providers, using patented spam-fighting technology.
- trimMail
- Network appliance that filters spam and content and protects email servers from being used as an open relay by junk mailers.
- TurnTide
- Developers of an anti-spam router.
- Vipul's Razor
- Distributed, collaborative, spam detection and filtering network.
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