Gmail MX over IPv6

Olivier MJ Crepin-Leblond ocl at
Sun Jun 17 01:03:28 CEST 2012

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
> is already accepting mail over an IPv6 MX:

Yes, but they appear to have "forgotten" which at some
point used to call gmail.

[root at waikiki log]# dig +short mx
[root at waikiki log]# dig +short

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

Received-SPF: softfail ( domain of transitioning ocl at does not designate 2a00:19e8:10:5::b as permitted sender) client-ip=2a00:19e8:10:5::b;


Received-SPF: pass ( domain of ocl at designates as permitted sender) client-ip=;

Anyone else with this problem?

Kind regards,


Olivier MJ Crépin-Leblond, PhD

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