Re: IPv6 mail, was Let's try to be productive...

On 1/8/2014 8:20 AM, Richard Clayton wrote:
> If IPv6 email really takes off (and that certainly won't be soon (IMO)
> apart from some special cases), then we might very well see ISPs and/or
> the really big mail handlers (Gmail, Yahoo &c) using one IPv6 address
> per account ...
>
> ... this will allow people to block (or perhaps whitelist) specific
> people who are using mass platforms without having to agonise over the
> pain of blocking "the whole of gmail/whatever"


(taking up an old thread.)


They don't have to wait.

They could sign with DKIM, using a different d= domain name for every 
user.

By way of an easy convention to extend d= granularity, they could 
'encode' the author's full address into d=, such as:

    <selector>._domainkey.<mailbox>._at.<domain>

e.g.,

    1234._domainkey.richard._at.example.com


d/

ps. No, this doesn't enable evaluation when the connection is first 
attempted or opened.

-- 
-- 
Dave Crocker
Brandenburg InternetWorking
bbiw.net
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