On 11/10/2010 6:32 AM, Michael Scheidell wrote: > On 11/10/10 2:45 AM, Matus UHLAR - fantomas wrote: >> On 10.11.10 08:23, Per Jessen wrote: >>> I got the following reject this morning: >>> >>> <book...@example.com>: host mail.example.com[1.2.3.4] said: 550 Dynamic >>> Style reverse DNS IP=[212.25.14.40].Rejected by MagicSpam >>> 1.0.4-9.1 >>> (http://www.magicspam.com/). >> 40.14.25.212.in-addr.arpa. 3600 IN CNAME >> 40.32-63.14.25.212.in-addr.arpa. >> >> well, the 40.32-63.14.25.212.in-addr.arpa is surely dynamic-looking ;-) >> > as expected for classless DNS CIDR subdelegation, and valid according > to rfrc's. magicspam didn't resolve the cname (either of them I > suspect). > not sure if I would use a cnam for quarantine.spamcheck.net. .. just > put a second record in the zone file.
This looks like RDNS delegation to me, allowing a statically assigned block of addresses from an ISP to control their own RDNS lookups.The owner of the address block wouldn't be able to modify the upstream's RDNS zone files so that's why the upstream has put in CNAME records, to force the resolver to the owners zone file. and if it is... most certainly not a dynamic ip. -lee > > host -t ptr 212.25.14.40 > 40.14.25.212.in-addr.arpa is an alias for > 40.32-63.14.25.212.in-addr.arpa. > 40.32-63.14.25.212.in-addr.arpa domain name pointer > quarantine.spamchek.net. > # host -t a quarantine.spamchek.net > quarantine.spamchek.net is an alias for thorium.enidan.ch. > thorium.enidan.ch has address 212.25.14.40 > # host -t a thorium.enidan.ch > thorium.enidan.ch has address 212.25.14.40 > > >
