Tony Finch wrote: > On Wed, 1 Oct 2008, Mike Cardwell wrote: > >> Marc Perkel wrote: >> >>> I'm having luck looking up the name servers of the sending host to see >>> if it's blacklisted >>> >> But how accurate is it? >> > > I did some similar experiments, and I found that it's not unusual for an > email-oriented blacklist to catch a nameserver used for legitimate email. > For example, a hosting service that has various dodgy web servers gets a > /24 blocked which happens to include a nameserver which is not just used > for the dodgy webservers but for various other well-behaved customers. > >
I'm not testing the IP of the name server. I'm looking up the host name in a host name based blacklist. What it's catching is new "tasting" domains that use existing blacklisted names for nameservers. -- ## List details at http://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
