IPv6-working freemail status

[Joseph T. Klein]

Could this be a quad A reverse issue?

I have been running IPv6 (Sendmail) SNMP for some time.

I have been seeing more rejections based on the AAAA record, took me a
couple of passes to figure out why. By default XP SP2 is set with
anonymous address interface identifiers. I had one XP system so set and
had fixed IPv6 reverses on all other systems.

In the last month we started to see rejected e-mail from mail sent by
that system. I assume that some new widespread software patch just
started to check the AAAA reverses.

BTW the switch is:

netsh interface ipv6 set privacy state=disable

or

ipv6 -p gpu UseTemporaryAddresses no


On 1/23/10 6:06 AM, Florian Weimer wrote:
> * Gert Doering:
> 
>>> Some mail filters unfortunately consider MX hosts resolving to IPv6 
>>> addresses as invalid and the message is rejected because of 
>>> that.  
>>
>> Can you name some specifics?  I've had an MX with IPv6 record since
>> 5 years or so, and have not encountered mail unreachables due to that.
> 
> MX entries which point to a name lacking an A record cause relatively
> widespread interoperability issues, due to sender domain verification
> failures.

-- 
Joseph T. Klein
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