LinuxMagic already did this (Score 0)

This isn't news... The team at LinuxMagic Inc (http://www.linuxmagic.com) has already been doing this for years with their MagicMail Server product (http://magicmail.linuxmagic.com), and more recently with the new MagicSpam software (http://www.magicspam.com) which can be installed on any email server.