The Spam Eater
- Easy to use spam blocker. Stop spam before it reaches your computer.
- http://spameater.com/

Katharion Anti Spam Solutions
- Provides spam and virus filtering services that keep unwanted mail off the network.
- http://www.katharion.com

E-Mail Magician
- Automates filter, mailbox, and nickname creation for Eudora Macintosh. Filters on more than 1,000 spam characteristics.
- http://www.yav.com/yav/emailmagician.html

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.
- http://www.soda3.com

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

MXLogic
- Protects your entire domain from spam and viruses. No software to install or maintain.
- http://www.mxlogic.com/

Email Systems
- Fully managed service which filters viruses, worms and malicious macros and spam. Firm with offices in UK, France and Sweden.
- http://www.emailsystems.com/

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.
- http://www.appriver.com/

LogicSMS Anti-Spam
- Provides server-side POP3 based spam filtering.
- http://www.logicsms.us

RMX - SMTP anti-forgery protocol
- Filtering protocol verifying the sender address through authorization records made available in DNS to prevent address forgery.
- http://www.danisch.de/work/security/antispam.html

BopSpam
- Online POP3 bayesian filtering service.
- http://www.bopspam.co.uk

0Spam.com
- Free antispam service for pop, Yahoo, and Hotmail accounts supporting multiple languages.
- http://www.0spam.com

LegMail
- Web based email service to retrieve and spam filter pop, Hotmail and Yahoo! accounts.
- http://www.legmail.com

NuXo Technologies
- Provides redundant managed email filtering services: protection against spam, virus and failure without changes to the existing installation.
- http://www.nuxo.com

Filterspam
- Spam filter service designed to protect children from junk emails.
- http://www.filterspam.co.uk/

ASSP
- Anti-Spam SMTP Proxy implementing platform independent email filtering services.
- http://assp.sourceforge.net/

Pyzor
- Open source collaborative spam filtering system using digests of messages to identify spams.
- http://pyzor.sourceforge.net/

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.
- http://spamassassin.apache.org/

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.
- http://www.eontech.com/spammgr

Sophos PureMessage
- Email management solution that provides full control over security and usage of corporate email systems.
- http://www.sophos.com/products/pm/?_x=3

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.
- http://www.gessworks.com/WebSite.nsf/page/mimeshield

Mailcleaner
- Offers e-mail filtering to stop spam and viruses at their server before it reaches to the end user.
- http://www.mailcleaner.net/index_en.html

Realmailonly
- Email Spam filtering service for businesses. Mailboxes available.
- http://www.realmailonly.com

MailControl
- Spam filtering protection for your corporate e-mail network.
- http://www.blackspider.com/services/mc_spam.htm

Cashette
- Only allows mail from people you know. Spammers have to pay the users to send them spam.
- http://www.cashette.com

Messagecleaner
- Remove viruses and spam mail before they reach your computer.
- http://www.messagecleaner.co.uk

SpamFixer
- SpamFixer is an anti-spam filtering solution for small businesses as well as enterprise sized organizations.
- http://www.spamfixer.com

SpamTrap
- Australian POP3 email spam filtering service requiring no software.
- http://www.spamtrap.net.au

SpamFilter for ISP
- Proxy software for incomming mail.
- http://www.logsat.com/spamfilter/

MailPolice
- Managed mail service with parental controls, POP/IMAP and Webmail.
- http://www.mailpolice.com

MailArmory
- Spam and virus defense for businesses and service providers.
- http://www.mailarmory.com

BayEmail
- Email filtering service.
- http://www.bayemail.com

Redcondor
- Stops spam before it ever reaches your network.
- http://www.redcondor.com

SimpleFilter
- SimpleFilter is a tool to help you filter junk mail (spam).
- http://www.simplefilter.com

Prolateral Consulting Ltd
- Host based anti-spam and anti-virus filtering plus several other internet security services.
- http://www.prolateral.com/pages/services/antispam.php

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

SpamStopsHere
- An email filtering service for businesses or individual domains. 30 day trial offered.
- http://www.spamstopshere.com/

Habeas
- Focuses on identifying, classifying, tagging and monitoring legitimate email.
- http://www.habeas.com/

Distributed Checksum Clearinghouse
- System of clients and servers that collect and count checksums of email messages in order to detect and filter bulk UCE.
- http://www.rhyolite.com/anti-spam/dcc/

SpamButcher
- Fuzzy-logic based anti-spam filter for Windows systems.
- http://www.spambutcher.com

CleanMyMailbox
- Whitelist-based service that automatically "cleans" mailboxes of unwanted email multiple times per hour.
- http://www.cleanmymailbox.com/

Spam Arrest, LLC
- POP3 service that blocks spam using sender verification methods.
- http://spamarrest.com

Atqui Spam Filter
- Filters spam email from current e-mail address of user.
- http://www.atqui.com

Anti Spam Software
- Provides anti spam software with server based email and web security features, email and spam filtering software for Network Administrators.
- http://www.anti-spam-software.net

CruelMail
- Provides spam-proof email accounts. Only allows email from addresses in whitelist. Charges a fee for others to reach the customer's mailbox.
- http://www.cruelmail.com/cgi-bin/main.cgi

Mailshell
- Offers protection against spam, combined with personalization and privacy for individual email users.
- http://mailshell.com/mail/client/fd.html

Singlefin
- E-mail filtering services. Provides spam filtering, anti-virus protection, attachment blocking, policy filtering, store and forwarding service, as well as detailed reporting.
- http://www.singlefin.net

E-Mail Preference Service
- Consumer opt out registration form for the Direct Marketing Association.
- http://www.dmaconsumers.org/optoutform_emps.shtml

Vipul's Razor
- Collaborative spam filtering network allowing users to report and filter out matching spam.
- http://razor.sourceforge.net/

Activator Mail
- Virus scanning and spam prevention based on blacklists and user feedback.
- http://www.activatormail.com

Spam Cop
- Spam reporting service.
- http://spamcop.net/

WhiteICE
- Provides filtered web-based e-mail accounts and web space.
- http://www.whiteice.com/

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.
- http://www.spamhole.com/