[dmarc-discuss] How does *this* mailing list interact with dmarc?

Franck Martin fmartin at linkedin.com
Fri Jun 22 09:01:23 PDT 2012


You can't use s= but may be you could use i= in combination with d= to build a reputation scheme.

On Jun 22, 2012, at 6:30 AM, Brian Corrigan wrote:

> Forgive the new guy...
> 
> One feature of DKIM that seems very interesting (and potentially
> applicable) is the ability to divide the key namespace up using
> selectors. If I understand correctly, wouldn't this address many of
> the problems being discussed here?
> 
> For example, in the case of a single (.edu?) domain that sends both
> transactional and user-generated emails, isn't it possible to use a
> separate key for each message type?
> 
> For that matter, if you used a key per user (granted, this would be a
> *lot* of keys) you could verify not only that the message originated
> from a specific domain, but from a specific user on that domain.  On
> the issue of mail forwarding agents, conceptually, wouldn't using per
> user keys solve the issue?
> 
> Finally, maybe a more practical approach is to have an arbitrarily
> large number of keys and just use a random one each time you sign.
> 
> Cheers,
> Brian
> 
> 
> On Wed, Jun 20, 2012 at 11:24 PM, John Levine <johnl at taugh.com> wrote:
>>> Anyhow this "alias" forwarding break DKIM is common on many other platforms/configs and DMARC points where.
>>> 
>>> How can we help?
>> 
>> Encourage those systems to sign their outgoing mail so recipients can
>> develop a reputation for them.
>> 
>> DMARC is not a FUSSP.  It is useful for a small but significant part
>> of the mail ecosystem for domains where all the mail comes from a
>> known, controlled set of hosts, and a lot of phishing is targeted at
>> them.  None of the other anti-spam and reputation techniques are going
>> away, and DMARC isn't a substitute for them.
>> 
>> R's,
>> John
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>> 
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> 
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