On Tue, 9 Feb 2010 11:42:07 -0500 dar...@chaosreigns.com wrote: > On 02/09, RW wrote:
> > What your > > scheme would do is check for otherwise legitimate servers that have > > been compromised and are delivering direct-to-mx. > > An otherwise legitimate but compromised mail server would not be > detected by this. I'm curious why you interpreted it differently. A compromised webserver with full-circle DNS would be caught by this. My point is that is the only class of spam that this could help with Every thing else is either handled by full-circle and no DNS tests, or can be easily worked around by spammers setting their own dns.
