nanog mailing list archives
Re: Arrogant RBL list maintainers
From: Rich Kulawiec <rsk () gsp org>
Date: Tue, 15 Dec 2009 22:33:11 -0500
[ Note: you're not talking about the RBL. You're talking about a DNSBL or RHSBL, which are generic terms. The RBL is a specific DNSBL and, as far as I know, does not have a listing policy related to this discussion. ] On Wed, Dec 09, 2009 at 03:18:47PM +0000, Sven Olaf Kamphuis wrote:
because they just assume that working, rfc compliant, reverse dns that just-so-happens to be automatically generated would indicate dynamic ip space..
It has long since become a best practice in mail server operations to pre-emptively blacklist all such space on sight. This is common knowledge among everyone who's kept pace with the field, and is an entirely appropriate reaction to what's sometimes called "the rise of the zombies". Real mail servers have non-generic, matching forward and reverse DNS with real hostnames. The farther hostnames move from that, the more problems can be expected. Nobody particularly likes this, as the work necessary in compiling such lists is onerous. But it is one of the most effective (in terms of FP and FN rates as well as resource costs) anti-spam measures available. ---Rsk
Current thread:
- Re: best practices for PTR naming and whois (was, sadly, Re: Arrogant RBL list maintainers), (continued)
- Re: best practices for PTR naming and whois (was, sadly, Re: Arrogant RBL list maintainers) Mark Andrews (Dec 10)
- Re: best practices for PTR naming and whois (was, sadly, Re: Arrogant RBL list maintainers) Michael Thomas (Dec 10)
- Re: best practices for PTR naming and whois (was, sadly, Re: Arrogant RBL list maintainers) Joe Abley (Dec 10)
- Re: best practices for PTR naming and whois (was, sadly, Re: Arrogant RBL list maintainers) Michael Thomas (Dec 10)
- Re: best practices for PTR naming and whois (was, sadly, Re: Arrogant RBL list maintainers) Steven Champeon (Dec 10)
- Re: Arrogant RBL list maintainers Michelle Sullivan (Dec 16)
- Re: Arrogant RBL list maintainers Steven Champeon (Dec 16)
- Re: Arrogant RBL list maintainers Mike Lieman (Dec 16)
- Re: Arrogant RBL list maintainers Steven Champeon (Dec 17)
- Re: Arrogant RBL list maintainers Michael Holstein (Dec 17)
- Re: Arrogant RBL list maintainers James Hess (Dec 15)
- Re: Arrogant RBL list maintainers Suresh Ramasubramanian (Dec 15)
- Re: Arrogant RBL list maintainers Adam Armstrong (Dec 16)
- Re: Arrogant RBL list maintainers Mike Lieman (Dec 16)
- Re: Arrogant RBL list maintainers William Herrin (Dec 16)
- Re: Arrogant RBL list maintainers Valdis . Kletnieks (Dec 16)
- Re: Arrogant RBL list maintainers Jack Bates (Dec 16)
- Re: Arrogant RBL list maintainers Matthew Petach (Dec 16)
- Re: Arrogant RBL list maintainers Jack Bates (Dec 16)