[AusNOG] IPv6 reverse DNS and Mail ...

[Terry Sweetser (SkyMesh CTO)]

I suspect that anyone running an actual server farm that is ipv6 aware 
and willing to use ipv6 will have static assignments and have rev dns 
set up ...

Given that the default behavior of many mail hosts now is to reject 
email from anything lacking (valid) rev dns that would be a major 
concern for an ipv6 enabled mail farm.

Sadly, most of the people sending making complaints do not run the mail 
server(s) at their organizations.

IPv6 deployment should not be a simple "turn on RA and hope for the 
best" for any organization.

http://about.me/terry.sweetser

On 20/05/13 14:27, Paul Brooks wrote:
> Which is how IPv6 is supposed to work, no?

> On 20/05/2013 2:06 PM, Scott Howard wrote:
> How many of these are from people that are actually aware that they are actually
> using IPv6 for email?
>
> I've seen this countless time where people enabled IPv6 on their local network, and
> their mail server automatically started attempting to use it for delivery.  At least
> one major appliance vendor also has this problem - as soon as it found an IPv6
> router being advertised, it would attempt to deliver all mail over IPv6 to any host
> with an AAAA address - all sourced from it's auto-configured address with no reverse
> DNS..