fetch()

Lookup an ADSP record in DNS.

  my $policy = Mail::DKIM::AuthorDomainPolicy->fetch(
            Protocol => 'dns',
            Author => 'jsmith@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".

new()

Construct a default policy object.

  my $policy = Mail::DKIM::AuthorDomainPolicy->new;

parse()

Construct an ADSP record from a string.

  my $policy = Mail::DKIM::AuthorDomainPolicy->parse(
          String => 'dkim=all',
          Domain => 'aaa.example',
      );

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. 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

is_implied_default_policy()

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.

location()

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".

policy()

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.

signall()

True if policy is "all".

signall_discardable()

True if policy is "strict".