Gmail MX over IPv6

Erik Kline ek at
Mon Jun 18 02:30:48 CEST 2012

On 18 June 2012 09:11, James Cloos <cloos at> wrote:
>>>>>> "WSR" == Wolfgang S Rupprecht <wolfgang.rupprecht at> writes:
> WSR> I got a hardfail from gmail.  Their SPF parsing for IPv6 is messed
> WSR> up.  Maybe the "::" notation scewed up a string compare to
> WSR> ":0:0:0:" or ":0:0:0:0:"?
> I can confirm that.  I have a ip6: netblock in my spf and my outgoing
> box's ipv6 is typically ascii-fied with a ::.  When I configure my
> MTA to prefer ipv6 for outgoing, goog shows an spf fail.  When the MTA
> uses ipv4 goog is happy.
> I can see three possibilities:
>  Their spf parses doesn't grok ip6: tagged entries at all.
>  It doesn't handle addr/prefix notation for ipv6.
>  It cannot compare explicit vs :: notation.

An issue with SPF parsing was raised and I'm told a fix should be
rolling out this week.

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