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Vote for GateWall Antispam
GateWall Antispam is a mail gateway solution with integrated spam filtering and antivirus tools. The product is built from multiple modules, which makes it more failsafe and allows running the server on a distributed system. GateWall Antispam supports all the leading spam filtering technologies and features Cloud Antispam and Bayesian statistical spam filtering solution designed by Entensys.
When processed by GateWall Antispam, messages go through several filtering stages, including connection filtering, sender filtering, recipient filtering and content filtering.