Re: How will we manage IPv6 spam?

On 08/17/2012 01:51 PM, Daniel Feenberg wrote:
>
>
> On Fri, 17 Aug 2012, John R. Levine wrote:
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>> Hi.  Remember the ASRG?  I was hoping it might do a little research.
>>
>> In talking to people about IPv6 mail, I'm still coming to the conclusion that anyone who thinks they know how they're going to handle it, beyond the current toy scale, doesn't understand the problem.  Things we might address include:
>>
>
> I would not expect to accept any IPv6 mail until users come forward to show me that they wish to correspond with MTAs that have no IPv4 connection ability. While this may happen in the fullness of time, I don't expect it soon. Now and for the foreseeable future such a system would have very little connectivity, far less than a blacklisted spam source.

Host operating systems -- all of them to my knowledge -- prefer v6 over
v4 if you have a public v6 address. So the mere existence of a AAAA associated
with the MX will cause the sender to pick the v6 destination. I have a v6 mail
system and got bitten because I had forgot to put up the v6 reverse map. It
will happen just as a natural consequence of people enabling v6 on their
infrastructure.

Mike