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"
               );

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.