Reverse DNS question

Darren Pilgrim list_freebsd at
Wed Feb 19 11:18:34 UTC 2014

On 2/19/2014 1:19 AM, Mark Tinka wrote:
> On Wednesday, February 19, 2014 11:01:53 AM Arthur Chance
> wrote:
>> Slightly changing the topic, does anyone have any idea
>> how IPv6 is going to affect use of RDNS for spam
>> prevention? Given that machines will often have multiple
>> addresses, do we have to bolt down our MTAs to using
>> specific publicly visible addresses, or is RDNS just
>> going to get dropped. I don't have an IPv6 system to
>> play with yet.
>  From a spam prevention perspective, nothing changes,
> operationally.
> My expectation is that mail server operators will require
> similar checks in IPv6.

Google has made IPv6 RDNS effectively mandatory for communicating with 
gmail servers.

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