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Current File : /usr/share/doc/libmail-dkim-perl/policies.txt
Policy lookup
=============

With DomainKeys and DKIM you have two different ideas of
sender signing policies. Luckily, they are published at slightly
different locations in DNS, so it might work to have them complement
each other. This text file is just a place to dump some ideas about
this.

Here is a description of the two different sender signing policies:
* rfc4870(historical) - the DomainKeys policy
   - this policy addresses emails in which the sender's domain appears
     in the "Sender" header (or the "From" header if no Sender).
     As such, it could be useful for mailing lists (which break the
     author's signature but add a Sender header to indicate where
     it's coming from) or third party mailers (which cannot sign for
     the From address but can add a Sender address). The downside is
     that most MUAs don't show the Sender header, so recipients still
     think the message is coming from whatever address is in the From
     header.

* draft-allman-dkim-ssp - the work-in-progress IETF DKIM policy
   - this policy addresses the "From" address only.
     This would be useful for domains with low tolerances for forgeries.
     They could ensure that whenever their domain appears in the From
     field, DKIM-SSP-aware agents can throw away forgeries.
     The downside is mailing lists and third-parties can't really use
     it, and users of those critical domains can't participate in
     mailing lists or use third-party mailers.


Example A
---------

From:   Jason <jason@bigbank.com>
Sender: Bad guy <badguy@example.org>

In this case, bigbank.com wants to provide a way for recipients
to recognize forgories or altered messages coming from their domain.

They publish a draft-allman-dkim-ssp policy record in their DNS

  bigbank.com.      DKIMP  "p=strict"

With such a policy, bigbank.com's users cannot send mail through
mungling mailing lists, or through their other ISPs mail servers.
In the first case, the signature would become invalid. In the second
case, the message won't have a signature. In both cases, the policy
for bigbank.com says to reject the message.


Example B
---------

From:   Jason <jlong@messiah.edu>
Sender: My list <discuss@list.example.com>

In this example, messiah.edu allows their users to send messages through
mailing lists, so it has no need for a p=strict policy like example A.
However, this means messages can be trivially forged.

But maybe they could use a rfc4870(historical) policy to indicate that
whenever the "sender" of the message is a messiah.edu address, the
message will contain a messiah.edu signature. So...

  _domainkey.messiah.edu.  TXT  "o=-"

When this message comes through, it is allowed despite not having a valid
messiah.edu signature because the message itself doesn't claim to have
come from messiah.edu (although some recipients may not know this because
their MUA doesn't show it).

But if the only originator address found in the message was
jlong@messiah.edu, the above policy would require a valid messiah.edu
signature.


Example C
---------

From:   George <george@example.com>
Sender: Discuss <discuss@listserv.messiah.edu>

This time I'm interested in the perspective of the Listserv operator.
The Listserv operator wants to ensure that messages going out to the
list have a listserv.messiah.edu signature, and wants to communicate
to recipients that unsigned messages claiming to be from the list are
forgories.

Once again, a rfc4870(historical) policy seems the most useful:

  _domainkey.listserv.messiah.edu.   TXT   "o=-"

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