Hi, The archivers list mentioned in ISPConfig 3 user manual are not complete. Amavisd-new will still complain that it could not find such such archivers etc. Those archivers can open more file types and check its content. Here are some extra archivers which I found useful: apt-get install lha p7zip-full unrar-free ripole rpm2cpio ripole means Rip OLE which is MS OLE type document. They are all free.
These archivers are optional and not needed by amavisd. Fee free to install them if you receive emails in tehse formats, but the arcivers are not required by amvisd.
