On Tue, Apr 27, 2004 at 06:51:23AM -0700, Hallam-Baker, Phillip wrote:
|
| Accreditation is out of scope here, but MARID is a component of a
| spam solution not a complete solution in itself.
|
| Today MARID + Spam filter = improved spam situation
| Future MARID + Accreditation = The end of spam
|
On that note, I would like to announce that the SPF draft has added an
accreditation modifier. It should be sufficient for linking to
accreditation services. The deliverability industry has responded well
to this proposed addition. Comments and criticism welcome.
5.3 accredit: Sender Accreditation
accreditation = 'accredit' '=' domain-spec
The argument to the accreditation modifier is a domain-spec to be
macro-expanded and queried. The result of the query is interpreted
according to the definitions set forth by the accreditation service.
For example,
accredit=%{d}.accreditation-provider.example.com
accredit=%{ir}.accreditation-provider.example.com
This facility allows the publishing domain to make independently
verifiable assertions about itself in machine-readable form.
Multiple "accredit" modifiers may appear in one SPF record.
The "accredit" modifier is OPTIONAL. SPF publishers MAY omit it.
SPF clients MAY ignore any or all "accredit" modifiers. If a
receiver does not recognize the domain-spec argument, it MAY ignore
the modifier.
It is expected that SPF-enabled receivers will maintain a library of
recognized accreditation providers, keyed by the domain-spec. An
accreditation provider is responsible for describing the protocol
it uses to encode assertions. For example, suppose an accreditation
provider supports DNS "A" queries against the expanded domain-spec.
Suppose a result of NXDOMAIN means "domain is not known to the
accreditation service." Suppose a result of "127.0.0.10" means "the
accreditation service vouches for the integrity of the sender
domain." Accreditation providers can make up any protocol they like
as long as they can convince receivers to use it.
Accreditation is only meaningful if the result of the SPF query is a
PASS.