0Spam.com: Free antispam service for pop, Yahoo, and Hotmail accounts supporting multiple languages.
Activator Mail: Virus scanning and spam prevention based on blacklists and user feedback.
Anti Spam Software: Provides anti spam software with server based email and web security features, email and spam filtering software for Network Administrators.
AppRiver Spam Filtering: An email security company specializing in spam and virus protection, offering SecureTide, a hosted spam protection service, and Message Sniffer, a scanning engine especially for OEMs.
ASSP: Anti-Spam SMTP Proxy implementing platform independent email filtering services.
Atqui Spam Filter: Filters spam email from current e-mail address of user.
BayEmail: Email filtering service.
BopSpam: Online POP3 bayesian filtering service.
Cashette: Only allows mail from people you know. Spammers have to pay the users to send them spam.
CleanMyMailbox: Whitelist-based service that automatically "cleans" mailboxes of unwanted email multiple times per hour.
ConsumerSearch.com: Spam Filters: Identifies which products reviewers like and dislike, where they agree or disagree, and why.
CruelMail: Provides spam-proof email accounts. Only allows email from addresses in whitelist. Charges a fee for others to reach the customer's mailbox.
Distributed Checksum Clearinghouse: System of clients and servers that collect and count checksums of email messages in order to detect and filter bulk UCE.
E-Mail Magician: Automates filter, mailbox, and nickname creation for Eudora Macintosh. Filters on more than 1,000 spam characteristics.
E-Mail Preference Service: Consumer opt out registration form for the Direct Marketing Association.
Email Systems: Fully managed service which filters viruses, worms and malicious macros and spam. Firm with offices in UK, France and Sweden.
Ezine Check: Checks your newsletter to see if it is spam. This service stops your opt-in newsletter from being labeled as spam.
Filterspam: Spam filter service designed to protect children from junk emails.
Gateway Defender: Managed service provider that specializes in email security and control.
Habeas: Focuses on identifying, classifying, tagging and monitoring legitimate email.
LegMail: Web based email service to retrieve and spam filter pop, Hotmail and Yahoo! accounts.
LogicSMS Anti-Spam: Provides server-side POP3 based spam filtering.
MailArmory: Spam and virus defense for businesses and service providers.
Mailcleaner: Offers e-mail filtering to stop spam and viruses at their server before it reaches to the end user.
MailControl: Spam filtering protection for your corporate e-mail network.
MailPolice: Managed mail service with parental controls, POP/IMAP and Webmail.
Mailshell: Offers protection against spam, combined with personalization and privacy for individual email users.
Messagecleaner: Remove viruses and spam mail before they reach your computer.
MIMEShield: Runs as domino server task, NO template customizations, supports blacklists/whitelists, Spam email categorization, Electronic fingerprinting, Supports multiple Maps/RBL blacklists, Auto whitelist generation on outbound SMTP traffic.
MXLogic: Protects your entire domain from spam and viruses. No software to install or maintain.
NuXo Technologies: Provides redundant managed email filtering services: protection against spam, virus and failure without changes to the existing installation.
Peer-to-Peer: Anti-Spam gateway which filters out spam and viruses for an entire domain. A 30-day free trial is offered.
POPFile: Open source automatic mail classification tool using Bayesian statistical methods. Offers details about installation and configuration procedures for the windows client.
Prolateral Consulting Ltd: Host based anti-spam and anti-virus filtering plus several other internet security services.
Pyzor: Open source collaborative spam filtering system using digests of messages to identify spams.
Realmailonly: Email Spam filtering service for businesses. Mailboxes available.
Redcondor: Stops spam before it ever reaches your network.
RMX - SMTP anti-forgery protocol: Filtering protocol verifying the sender address through authorization records made available in DNS to prevent address forgery.
Sender Policy Framework (SPF): Framework for publishing information through DNS describing a list of ip addresses allowed to send emails from a specific domain.
SimpleFilter: SimpleFilter is a tool to help you filter junk mail (spam).
Singlefin: E-mail filtering services. Provides spam filtering, anti-virus protection, attachment blocking, policy filtering, store and forwarding service, as well as detailed reporting.
Sophos PureMessage: Email management solution that provides full control over security and usage of corporate email systems.
Spam Arrest, LLC: POP3 service that blocks spam using sender verification methods.
Spam Cop: Spam reporting service.
Spam Hole: Provides free, anonymous, temporary e-mail forwarding addresses. These addresses can be created on the fly. You decide how long the address lasts.
Spam Interceptor: Anti-spam software utilizing a combination of filters and a human only authentication system.
Spam Manager Professional: Spam Manager Professional is a windows based gateway filter for SMTP email servers. This filter uses DNSBL Servers to reject junk or spam mail coming from blacklisted servers.
Spamache: Web based spam filtering service. Checks POP accounts every 10 minutes and removes spam based on filtering rules as well as personal white & black lists.
SpamAssassin: A mail filter, written in Perl, to identify spam using a wide range of heuristic tests on mail headers and body text. Free software. Can be used as a standalone mail filter, or from procmail.
SpamButcher: Fuzzy-logic based anti-spam filter for Windows systems.
SpamFilter for ISP: Proxy software for incomming mail.
SpamFixer: SpamFixer is an anti-spam filtering solution for small businesses as well as enterprise sized organizations.
SpamForce: Provides anti-spam solutions for home and corporate environments.
SpamStopsHere: An email filtering service for businesses or individual domains. 30 day trial offered.
SpamTrap: Australian POP3 email spam filtering service requiring no software.
The Spam Eater: Easy to use spam blocker. Stop spam before it reaches your computer.
Vipul's Razor: Collaborative spam filtering network allowing users to report and filter out matching spam.
WhiteICE: Provides filtered web-based e-mail accounts and web space.