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.
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.
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