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specification 200404.txt introduces "accredit" modifier

2004-04-25 13:41:53
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 clients MAY ignore it.
   SPF publishers MAY omit it.  If a receiver does not recognize the
   domain-spec argument, it is free to 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 providers 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 parse it.


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