Filtering

Activator Mail - - Virus scanning and spam prevention based on blacklists and user feedback.

AppRiver Spam Filtering - - An email security company offering hosted spam and virus protection and a scanning engine especially for OEMs.

ASSP - - Anti-Spam SMTP Proxy implementing platform independent email filtering services.

BopSpam - - Online POP3 bayesian filtering service.

Clapf - - An open source email content filter application. Clapf is a modular statistical antispam application with an interface to popular antivirus programs.

CleanMailOnline - - Online Spam and Virus Filtering, filter before mail reaches your computer.

CleanMyMailbox - - Whitelist-based service that automatically "cleans" mailboxes of unwanted email multiple times per hour.

CruelMail - - Provides spam-proof email accounts. Only allows email from addresses in whitelist. Charges a fee for others to reach the customer's mailbox.

Dicontas - - UK based provider of email filtering, email monitoring and centralized administration services for business users.

Distributed Checksum Clearinghouse - - System of clients and servers that collect and count checksums of email messages in order to detect and filter bulk UCE.

The Email Laundry - - Spam filtering service to block spam and viruses by domain.

E-Mail Magician - - Automates filter, mailbox, and nickname creation for Eudora Macintosh. Filters on more than 1,000 spam characteristics.

Email Solutions - - UK firm specializing in hosted spam and virus protection through MX redirection. Subscription based. A 30 day free trial is offered.

Email Systems - - Fully managed service which filters viruses, worms and malicious macros and spam. Firm with offices in UK, France and Sweden.

FakeMX - - Providing a service to temporarily reject mail directed at low priority servers.

Filterspam - - Spam filter service designed to protect children from junk emails.

Habeas - - Focuses on identifying, classifying, tagging and monitoring legitimate email.

Katharion - - Provides spam and virus filtering services that keep unwanted mail off the network.

LegMail - - Web based email service to retrieve and spam filter pop, Hotmail and Yahoo! accounts.

MailArmory - - Spam and virus defense for businesses and service providers.

Mailcleaner - - Swiss company offering e-mail filtering to stop spam and viruses at the server level before it reaches the end user.

MailControl - - Spam filtering protection for your corporate e-mail network.

MailFilterPro - - Web-based spam and virus filtering services for small business.

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.

MailShield - - Australian company offers a managed service with protection from viruses, spam, malware, phishing and unwanted content.

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.

MX Force - - Enables VARs, OEMs, and ISPs to provide world-class managed email security services.

MX Lab - - A Belgium based company that blocks virus threats and unwanted emails through MX redirection. Also provides archiving and backup services.

MX Police - - Managed anti-spam, virus and malware protection.

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.

Online Spam Solutions - - Managed spam blocker and filtering service for small businesses. Blocks spam and viruses through MX redirection. A 30 day free trial is offered.

Peer-to-Peer - - Anti-Spam gateway which filters out spam and viruses for an entire domain. A 30-day free trial is offered.

Prolateral Consulting Ltd - - UK 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.

Red Condor - - Stops spam before it reaches your network. Managed spam filtering service blocks spam, viruses, spyware, and phishing schemes. A 30 day free trial is offered.

RMX - SMTP anti-forgery protocol - - Filtering protocol verifying the sender address through authorization records made available in DNS to prevent address forgery.

Securence - - Managed spam service offering Anti Spam and Anti Virus filtering technologies.

Sender Policy Framework (SPF) - - Framework for publishing information through DNS describing a list of ip addresses allowed to send emails from a specific domain.

SODA3 - - Mobile email filtering service for POP3. Filters your view of your mailbox so you only see email from important senders on your mobile device.

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.

The Spam Eater - - Checks your existing POP3 email account every ten minutes and filters spam and viruses. A 30 day free trial is offered.

Spam Filtering for Mail Exchangers - - Document offers detailed discussion on how to filter junk mail in incoming SMTP transactions.

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.

Spam Soap - - Managed spam service featuring message store/forward, message archiving, and administration at both end user and domain levels.

SpamButcher - - Fuzzy-logic software based anti-spam filter for Windows systems.

SpamCerbere - - Offers spam protection that doesn't require any installation. Based on a challenge-response system. Free service.

0Spam.com - - Free antispam service for pop, Yahoo, and Hotmail accounts supporting multiple languages.

SpamDrain - - Swedish company filters individual POP3 and IMAP accounts as well as entire domains. No software installations required. Offers a 30-day trial.

SpamFiend - - Managed spam and virus filtering service utilizing MX redirection to filter your domain. Allows policy-based attachment blocking.

SpamFilter for ISP - - Proxy software for incomming mail.

SpamStopsHere - - An email filtering service for businesses or individual domains. 30 day trial offered.

SpamTrap - - Australian POP3 email spam filtering service requiring no software.

Vipul's Razor - - Collaborative spam filtering network allowing users to report and filter out matching spam.