nanog mailing list archives
Re: is reverse dns required? (policy question)
From: Valdis.Kletnieks () vt edu
Date: Wed, 01 Dec 2004 14:41:00 -0500
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%?
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Current thread:
- is reverse dns required? (policy question) Greg Albrecht (Dec 01)
- Re: is reverse dns required? (policy question) J.D. Falk (Dec 01)
- Re: is reverse dns required? (policy question) Robert Hayden (Dec 01)
- Re: is reverse dns required? (policy question) Steven Champeon (Dec 01)
- Re: is reverse dns required? (policy question) Valdis . Kletnieks (Dec 01)
- Re: is reverse dns required? (policy question) Steven Champeon (Dec 01)
- Re: is reverse dns required? (policy question) Valdis . Kletnieks (Dec 01)
- Re: is reverse dns required? (policy question) Steven Champeon (Dec 01)
- Re: is reverse dns required? (policy question) Andre Oppermann (Dec 02)
- Re: is reverse dns required? (policy question) Valdis . Kletnieks (Dec 02)
- Re: is reverse dns required? (policy question) Andre Oppermann (Dec 02)
- Re: is reverse dns required? (policy question) Mark Andrews (Dec 02)
- Re: is reverse dns required? (policy question) Douglas Otis (Dec 02)
- Re: is reverse dns required? (policy question) Andre Oppermann (Dec 03)
- Re: is reverse dns required? (policy question) Henning Brauer (Dec 04)
- Re: is reverse dns required? (policy question) Robert Hayden (Dec 01)
- Re: is reverse dns required? (policy question) J.D. Falk (Dec 01)