| DESCRIPTION | 
| Purpose | 
A dkim_policy_t is a value from an enumerated list of the possible
    signing policy options available.  The policy for a signing domain is
    retrieved during verification, and made available via the
    dkim_policy() function. | 
 
| Possible Values | 
-  DKIM_POLICY_NONE -- this domain published no policy, or policy
                                  has not been or could not be retrieved
 -  DKIM_POLICY_UNKNOWN -- messages from this domain may or may not
                                     include a signature from the same domain
 -  DKIM_POLICY_ALL -- all messages from this domain include
                                 a signature from the same domain
 -  DKIM_POLICY_DISCARDABLE -- all messages from this domain include
                                         a signature from the same domain, and
                                         any that don't should be considered
                                         discardable
  
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