Reverse DNS question

Arthur Chance freebsd at
Wed Feb 19 12:02:49 UTC 2014

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.

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