Mail::DKIM::AuthorDomainPolicy(User Contributed Perl DocumentatiMail::DKIM::AuthorDomainPolicy(3)
Mail::DKIM::AuthorDomainPolicy - represents an Author Domain Signing Practices (ADSP)
The Author Domain Signing Policies (ADSP) record can be published by any domain to help a
receiver know what to do when it encounters an unsigned message claiming to originate from
The record is published as a DNS TXT record at _adsp._domainkey.DOMAIN where DOMAIN is the
domain of the message's "From" address.
More details about this record can be found by reading the specification itself at
Lookup an ADSP record in DNS.
my $policy = Mail::DKIM::AuthorDomainPolicy->fetch(
Protocol => "dns",
Author => 'firstname.lastname@example.org',
If the ADSP record is found and appears to be valid, an object containing that record's
information will be constructed and returned. If the ADSP record is blank or simply does
not exist, an object representing the default policy will be returned instead. (See also
"is_implied_default_policy()".) If a DNS error occurs (e.g. SERVFAIL or time-out), this
method will "die".
Construct a default policy object.
my $policy = Mail::DKIM::AuthorDomainPolicy->new;
Construct an ADSP record from a string.
my $policy = Mail::DKIM::AuthorDomainPolicy->parse(
String => "dkim=all",
Domain => "aaa.example",
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:
The message is approved by the sender signing policy.
The message is rejected by the sender signing policy. It can be considered very
The message is neither approved nor rejected by the sender signing policy. It can be
considered somewhat suspicious.
Note: in the future, these values may become:
none - no ADSP record is published
pass - a passing signature is present
fail - ADSP record is "all" and no passing signature is found
discard - ADSP record is "discardable" and no passing signature is found
nxdomain - the DNS domain does not exist
temperror - transient error occurred
permerror - non-transient error occurred
Tells whether 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
Tells where the policy was fetched from.
If the policy is domain-wide, this will be domain where the policy was published.
If the policy is user-specific, TBD.
If nothing is published for the domain, and the default policy was returned instead, the
location will be "undef".
Get or set the outbound signing policy (dkim=) tag.
my $sp = $policy->policy;
Outbound signing policy for the entity. Possible values are:
The default. The entity may sign some or all email.
All mail from the domain is expected to be signed, using a valid Author signature, but
the author does not suggest discarding mail without a valid signature.
All mail from the domain is expected to be signed, using a valid Author signature, and
the author is so confident that non-signed mail claiming to be from this domain can be
automatically discarded by the recipient's mail server.
The domain is out of scope, i.e., the domain does not exist in the DNS.
True if policy is "all".
True if policy is "strict".
o Section 4.3 of the specification says to perform a query on the domain itself just to
see if it exists. This class is not currently doing that, i.e. it might report
NXDOMAIN because _adsp._domainkey.example.org is nonexistent, but it should not be
treated the same as example.org being nonexistent.
Jason Long, <email@example.com>
COPYRIGHT AND LICENSE
Copyright (C) 2006-2009 by Messiah College
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.
perl v5.16.3 2010-01-23 Mail::DKIM::AuthorDomainPolicy(3)