[AusNOG] IPv6 reverse DNS and Mail ...

[Scott Howard]

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...

 Scott



On Sun, May 19, 2013 at 8:55 PM, Terry Sweetser (SkyMesh CTO) <
terry+AusNOG at skymesh.net.au> wrote:

> Hello NOGGERS,
>
> At SkyMesh, we routinely get "submissions" from remote mail admins to stop
> blocking their email.
>
> It turns out on many occasion that the remote site has ipv6, no reverse
> dns, and is connecting to our MX farm on ipv6.
>
> So, if you're running an outbound mail server or farm of servers and start
> using ipv6, do the rest of us a big favour:
>
> Get your rev.dns set up on those servers.
>
> --
> http://about.me/terry.sweetser
>
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