Gmail MX over IPv6

[Wolfgang S. Rupprecht]

Olivier MJ Crepin-Leblond <ocl at gih.com> writes:
> On 15/06/2012 23:30, Luca BRUNO wrote :
>> I'm not sure if it is a recent change or if I have just been
>> white-listed, but today in mailserver logs I've spotted that gmail.com
>> is already accepting mail over an IPv6 MX:
>
> Yes, but they appear to have "forgotten" googlemail.com which at some
> point used to call gmail.
>
> [root at waikiki log]# dig +short mx googlemail.com
> 10 alt1.gmail-smtp-in.l.google.com.
> 20 alt2.gmail-smtp-in.l.google.com.
> 30 alt3.gmail-smtp-in.l.google.com.
> 40 alt4.gmail-smtp-in.l.google.com.
> 5 gmail-smtp-in.l.google.com.
> [root at waikiki log]# dig +short gmail-smtp-in.l.google.com.
> 173.194.67.27
>
> Also -- did anyone check whether it breaks the SPF checking? It appears
> that when gmail received email by IPv6, it doesn't recognise the IPv6
> address which my mailer uses as a permitted sender, thus spf=softfail

I got a hardfail from gmail.  Their SPF parsing for IPv6 is messed up.
Maybe the "::" notation scewed up a string compare to ":0:0:0:" or
":0:0:0:0:"?

Received-SPF: fail (google.com: domain of XXX at wsrcc.com does not designate 2001:5a8:4:7d1::1 as permitted sender) client-ip=2001:5a8:4:7d1::1;
Authentication-Results: mx.google.com; spf=hardfail (google.com: domain of XXX at wsrcc.com does not designate 2001:5a8:4:7d1::1 as permitted sender) smtp.mail=XXX at wsrcc.com

wsrcc.com.		3600	IN	TXT	"v=spf1 ip4:64.142.50.224/29 ip6:2002:408e:32e0::/48 ip6:2001:5a8:4:7d0::/60 -all"

-wolfgang
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