[ipv6-ops] Re: mail filtering based on reverse DNS

[Jima]

On Fri, 12 Aug 2011, Matt Ryanczak wrote:
> On 8/12/11 3:45 AM, Bjørn Mork wrote:
>> I'd love to see the matching forward for v6host.ipv6.6connect.net.  But
>> I fear it will exceed mailing list size limits somewhat...
>>
>> Unfortunately, the reverse pointer is rather useless without it.
>
> It does save a whois lookup and afaik no tools support inline whois
> lookups. Granted a PTR can say anything but as a professional courtesy
> to other netops people such wildcards are somewhat useful.

 ...as long as the rDNS isn't spoofed, in which case they're a waste of
time to netops.  (I'd barely call it spoofing, actually, since it's so
trivial.)

 IMO, PTR records without matching AAAA/A records are completely
meaningless, and my feelings of people who deploy such range from
misguided, to inept, to outwardly hostile.

     Jima