Mail::DKIM::DkPolicy - represents a DomainKeys Sender Signing Policy record
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.
my $policy = Mail::DKIM::DkPolicy->fetch(
Protocol => 'dns',
Sender => 'email@example.com',
The following named arguments are accepted:
always specify "dns"
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.
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;
my $policy = Mail::DKIM::DkPolicy->new;
my $policy = Mail::DKIM::DkPolicy->parse(
String => 'o=~; t=y'
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:
The message is approved by the sender signing policy.
The message is rejected by the sender signing policy.
The message is neither approved nor rejected by the sender signing policy. It can be considered suspicious.
A vertical-bar separated list of flags.
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.
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.
Human readable notes regarding the record. Undef if no notes specified.
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.
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.
Jason Long <firstname.lastname@example.org>
Marc Bradshaw <email@example.com>
Bron Gondwana <firstname.lastname@example.org> (ARC)
Work on ensuring that this module passes the ARC test suite was generously sponsored by Valimail (https://www.valimail.com/)
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.
To install Mail::DKIM, copy and paste the appropriate command in to your terminal.
perl -MCPAN -e shell
For more information on module installation, please visit the detailed CPAN module installation guide.