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Date: Wed, 19 Feb 2014 12:02:42 +0000
From: Arthur Chance <freebsd@qeng-ho.org>
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To: Darren Pilgrim <list_freebsd@bluerosetech.com>,
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Subject: Re: Reverse DNS question
References: <20140218180620.0807880cf0dd661482e394b9@3dresearch.com>
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On 19/02/2014 11:18, Darren Pilgrim wrote:
> 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.

Thank you. That was the sort of information I was after. So we will have 
to tell our MTAs to use specific addresses as opposed to wildcard binding.