nanog mailing list archives
Re: Fun new policy at AOL
From: Paul Vixie <vixie () vix com>
Date: 28 Aug 2003 18:10:51 +0000
Play with DNS MX records like QMTP does. Something like crocker.com. MX 65000 trusted-mx.crocker.com. MX 66000 untrusted-mx.crocker.com.
there are at least two problems with this approach. one is that an mx priority is a 16 bit unsigned integer, not like your example. another is that spammers do not follow the MX protocol, they deliberately dump on higher cost relays in order to make the victim's own inbounds carry more of the total workload of delivery. (additionally, many hosts do more spam filtering on their lower cost MX's than on their higher cost (backup?) MX's, and the spammers know this, and take advantage of it.) -- Paul Vixie
Current thread:
- Re: Fun new policy at AOL, (continued)
- Re: Fun new policy at AOL Joel Jaeggli (Aug 28)
- Re: Fun new policy at AOL David Lesher (Aug 28)
- Re: Fun new policy at AOL John Palmer (Aug 28)
- Re: Fun new policy at AOL Matthew Crocker (Aug 28)
- Re: Fun new policy at AOL Richard D G Cox (Aug 28)
- Re: Fun new policy at AOL Roland Perry (Aug 28)
- Re: Fun new policy at AOL Roland Perry (Aug 28)
- Re: Fun new policy at AOL Matthew Crocker (Aug 28)
- Re: Fun new policy at AOL Valdis . Kletnieks (Aug 28)
- Re: Fun new policy at AOL Matthew Crocker (Aug 28)
- Re: Fun new policy at AOL Paul Vixie (Aug 28)
- Re: Fun new policy at AOL Iljitsch van Beijnum (Aug 29)
- Re: Fun new policy at AOL Paul Vixie (Aug 29)
- Re: Fun new policy at AOL Joseph McDonald (Aug 29)
- Re: Fun new policy at AOL Omachonu Ogali (Aug 29)
- Re: Fun new policy at AOL Bruce Pinsky (Aug 29)
- Message not available
- Re: Fun new policy at AOL Omachonu Ogali (Aug 29)
- Re: Fun new policy at AOL Roland Perry (Aug 28)
- Re: Fun new policy at AOL Petri Helenius (Aug 28)
- Re: Fun new policy at AOL Matthew Crocker (Aug 28)
- Re: Fun new policy at AOL Petri Helenius (Aug 28)