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

On Fri 10/Jan/2014 04:53:09 +0100 John Levine wrote:
> 
>> Apart from being able to drop the connection slightly earlier
>> during the SMTP transaction, does this give you a significant
>> advantage over just blacklisting (or whitelisting) individual
>> email addresses? Something which I would think doesn't really
>> scale.
> 
> I think so.  Some advertisers not unreasonably use an address per 
> campaign, or they might have multiple brands with multiple
> domains.

Isn't that poor man's email authentication?  Some clients maintain a
pool of open connections, during a queue run, so as to optimize the
tcp/tls per-connection overhead.

> Some even use an encoded return address per recipient to make
> bounce and unsub handling more reliable.

That, a new EHLO, or a different DKIM signer, should change the token
used for reputation tracking without tearing the session down.

Ale
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