E.F.A stands for Email Filter Appliance. E.F.A is born out of a need for a cost-effective email virus & spam scanning solution after the ESVA project died.
We try to create a complete package using existing open-source anti-spam projects and combine them to a single easy to use (virtual) appliance.
For more information go to http://www.efa-project.org
E.F.A V3 is a rebuild of the previous ESVA; the same components are used whenever possible but are all updated to the latest version.