North American Network Operators Group|
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Re: is reverse dns required? (policy question)
On Wed, 01 Dec 2004 13:16:49 EST, Steven Champeon said: > FWIW, 40% or more of the inbound spam mail here comes from hosts with a > generic rDNS naming convention (even after DNSBLs and other obvious > forgery checks such as hosts using my domain(s)/IP(s) in HELO/EHLO). We > simply quarantine any mail from hosts without rDNS at all, and reject > all mail from non-whitelisted generic hosts. Any issues with dealing with the distinction between (for instance) FOO.generic.BAR.(com|net|org) (where generic is the 3rd level) and FOO.generic.BAR.co.uk (where it's a level further down)? Similarly, do you just treat all of *.info or *.biz as a generic swamp? Any other TLD-related issues you've identified in counting up that 40%?