Dennis Guhl put forth on 3/8/2011 11:52 AM: > If you are blocked because of Spamhaus' PBL you are on an consumer > dial up (http://www.spamhaus.org/pbl/)
FYI, the PBL isn't limited to dynamic listings. Many corporations add their unused IP space to the PBL, along with other IPs within their netblocks that shouldn't be sending direct mail. They do this as part of a multi-layered approach to network security, in addition to egress filtering at the edge firewalls. One errant mouse click by an apprentice/junior SA can accidentally disable an egress filter, as can a botched firmware update on a firewall or router, etc, etc. If, when such a thing occurs, you already have an internal spambot outbreak that the firewalls/routers were containing... I would have never considered this until one day the chief of network security at Nortel informed me they do precisely what I described above. Dorothy, you're not in Kansas anymore. -- Stan
