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.
SiftX
Spam filtering and email virus scanner service.
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.
The Spam Eater
Easy to use spam blocker. Stop spam before it reaches your computer.
Spam Gourmet
Provides disposable e-mail addresses. Users can also set up rule sets for trusted or permitted senders.
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.
Spam Resistor
A service that stops unwanted email by verifying senders addresses against a whitelist of friends.
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.
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