Apparantly a new feature from McAfee SaaS Endpoint Protection, called 'Rumor Technology' is being abused atm to turn small business computers into spam proxies. 'Rumor Technology' is used for updating McAfee 'SEP' on computers in a local network without an internet connection; 'Internet Independent Updating (IIU) allows non-Internet connected computers to use SaaS Endpoint Protection by using McAfee Rumor2 Technology.' link It turns out that f.i. a SBS 2003/2008 server that does have an internet connection and has McAfee SEP installed can be abused as a proxy for sending spam. Several users have complained that due to this bug, their IP has been blacklisted because they are now seen as email spammers. Some McAfee 'SEP' user complaints at technet.microsoft.com/Forums link (according to the last post in this thread, McAfee will issue a patch during next week). And some other reports on this nasty bug; link and link edit; CNET article link.