Re: Reverse IPv6 DNS checks on ietf MXs?

2009-03-09 Thread Andrew Sullivan
On Fri, Mar 06, 2009 at 04:42:29PM -0800, Doug Otis wrote: > > When there is to be reverse namespace, it should be ensured to work. In > reality, this is not always the case. That is either an impossible goal, or else a meaningless requirement. In some sense, the reverse tree always works: you

Re: Reverse IPv6 DNS checks on ietf MXs?

2009-03-06 Thread Doug Otis
On Mar 5, 2009, at 10:40 AM, Andrew Sullivan wrote: On Thu, Mar 05, 2009 at 10:32:28AM -0800, Doug Otis wrote: Note that there has been work in DNSOP suggesting that rejecting on the failure of reverse DNS lookup is not always a good idea. Agreed. Just to be clear: I am not sure I agree w

Re: Reverse IPv6 DNS checks on ietf MXs?

2009-03-05 Thread Joel Jaeggli
Andrew Sullivan wrote: > On Thu, Mar 05, 2009 at 10:32:28AM -0800, Doug Otis wrote: >>> Note that there has been work in DNSOP suggesting that rejecting on >>> the failure of reverse DNS lookup is not always a good idea. >> Agreed. > > Just to be clear: I am not sure I agree with those who t

Re: Reverse IPv6 DNS checks on ietf MXs?

2009-03-05 Thread Andrew Sullivan
On Thu, Mar 05, 2009 at 10:32:28AM -0800, Doug Otis wrote: >> Note that there has been work in DNSOP suggesting that rejecting on >> the failure of reverse DNS lookup is not always a good idea. > > Agreed. Just to be clear: I am not sure I agree with those who think reverse DNS should not be

Re: Reverse IPv6 DNS checks on ietf MXs?

2009-03-05 Thread Doug Otis
On Mar 5, 2009, at 6:30 AM, Andrew Sullivan wrote: On Thu, Mar 05, 2009 at 01:00:55PM +, Tim Chown wrote: Hi, Just an observation, I don't know whether its been changed or applied recently, but we had some mails to various IETF lists soft rejected overnight due to failure of the recei

Re: Reverse IPv6 DNS checks on ietf MXs?

2009-03-05 Thread Andrew Sullivan
On Thu, Mar 05, 2009 at 01:00:55PM +, Tim Chown wrote: > Hi, > > Just an observation, I don't know whether its been changed or applied > recently, but we had some mails to various IETF lists soft rejected > overnight due to failure of the receiving MX to perform a successful > reverse DNS loo

Re: Reverse IPv6 DNS checks on ietf MXs?

2009-03-05 Thread Dave Cridland
On Thu Mar 5 13:00:55 2009, Tim Chown wrote: Just an observation, I don't know whether its been changed or applied recently, but we had some mails to various IETF lists soft rejected overnight due to failure of the receiving MX to perform a successful reverse DNS lookup on the IPv6 sender addr

Re: Reverse IPv6 DNS checks on ietf MXs?

2009-03-05 Thread Jeroen Massar
Tim Chown wrote: [...] > It's not uncommon for IPv6 servers to be multiaddressed, so mail admins > will probably just need to be a wee bit more careful, and certainly try > to avoid using autoconf globals on servers. Nothing wrong with EUI-64 or autoconf, as long as you actually want them there ;)

Reverse IPv6 DNS checks on ietf MXs?

2009-03-05 Thread Tim Chown
Hi, Just an observation, I don't know whether its been changed or applied recently, but we had some mails to various IETF lists soft rejected overnight due to failure of the receiving MX to perform a successful reverse DNS lookup on the IPv6 sender address. - Transcript of session follows