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Man Pages

Manual Reference Pages  -  MAIL::DKIM::AUTHORDOMAINPOLICY (3)

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Mail::DKIM::AuthorDomainPolicy - represents an Author Domain Signing Practices (ADSP) record



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 that domain.

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 =>,

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:
accept The message is approved by the sender signing policy.
reject The message is rejected by the sender signing policy. It can be considered very suspicious.
neutral 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 happens.


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:
unknown The default. The entity may sign some or all email.
all 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.
discardable 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.
‘‘NXDOMAIN’’ 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 is nonexistent, but it should not be treated the same as being nonexistent.


Jason Long, <>


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.

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perl v5.20.3 MAIL::DKIM::AUTHORDOMAINPOLICY (3) 2012-11-28

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