NAME

       Mail::DKIM::DkPolicy - represents a DomainKeys Sender Signing Policy record

VERSION

       version 1.20230212

DESCRIPTION

       DomainKeys sender signing policies are described in RFC4870(historical). It is a record
       published in the message sender's (i.e. the person who transmitted the message) DNS that
       describes how they sign messages.

CONSTRUCTORS

   fetch() - fetch a sender signing policy from DNS
         my $policy = Mail::DKIM::DkPolicy->fetch(
                          Protocol => 'dns',
                          Sender => 'joe@example.org',
                      );

       The following named arguments are accepted:

       Protocol
           always specify "dns"

       Author
           the "author" of the message for which policy is being checked.  This is the first
           email address in the "From" header.  According to RFC 2822, section 3.6.2, the "From"
           header lists who is responsible for writing the message.

       Sender
           the "sender" of the message for which policy is being checked.  This is the first
           email address in the "Sender" header, or if there is not a "Sender" header, the "From"
           header.  According to RFC 2822, section 3.6.2, the "Sender" header lists who is
           responsible for transmitting the message.

       Depending on what type of policy is being checked, both the Sender and Author fields may
       need to be specified.

       If a DNS error or timeout occurs, an exception is thrown.

       Otherwise, a policy object of some sort will be returned.  If no policy is actually
       published, then the "default policy" will be returned.  To check when this happens, use

         my $is_default = $policy->is_implied_default_policy;

   new() - construct a default policy object
         my $policy = Mail::DKIM::DkPolicy->new;

   parse() - gets a policy object by parsing a string
         my $policy = Mail::DKIM::DkPolicy->parse(
                          String => 'o=~; t=y'
                      );

METHODS

   apply() - apply the policy to the results of a DKIM verifier
         my $result = $policy->apply($dkim_verifier);

       The caller must provide an instance of Mail::DKIM::Verifier, one which has already been
       fed the message being verified.

       Possible results are:

       accept
           The message is approved by the sender signing policy.

       reject
           The message is rejected by the sender signing policy.

       neutral
           The message is neither approved nor rejected by the sender signing policy. It can be
           considered suspicious.

   flags() - get or set the flags (t=) tag
       A vertical-bar separated list of flags.

   is_implied_default_policy() - is this policy implied?
         my $is_implied = $policy->is_implied_default_policy;

       If you fetch the policy for a particular domain, but that domain does not have a policy
       published, then the "default policy" is in effect. Use this method to detect when that
       happens.

   location() - where the policy was fetched from
       DomainKeys policies only have per-domain policies, so this will be the domain where the
       policy was published.

       If nothing is published for the domain, and the default policy was returned instead, the
       location will be "undef".

   note() - get or set the human readable notes (n=) tag
       Human readable notes regarding the record. Undef if no notes specified.

   policy() - get or set the outbound signing policy (o=) tag
         my $sp = $policy->policy;

       Outbound signing policy for the entity. Possible values are:

       "~" The default. The domain may sign some (but not all) email.

       "-" The domain signs all email.

   signall() - true if policy is /-"
   testing() - checks the testing flag
         my $testing = $policy->testing;

       If nonzero, the testing flag is set on the signing policy, and the verify should not
       consider a message suspicious based on this policy.

AUTHORS

       •   Jason Long <jason@long.name>

       •   Marc Bradshaw <marc@marcbradshaw.net>

       •   Bron Gondwana <brong@fastmailteam.com> (ARC)

THANKS

       Work on ensuring that this module passes the ARC test suite was generously sponsored by
       Valimail (https://www.valimail.com/)

COPYRIGHT AND LICENSE

       •   Copyright (C) 2013 by Messiah College

       •   Copyright (C) 2010 by Jason Long

       •   Copyright (C) 2017 by Standcore LLC

       •   Copyright (C) 2020 by FastMail Pty Ltd

       This library is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself, either Perl version 5.8.6 or, at your option, any later version of
       Perl 5 you may have available.