const (
	// A "pass" result is an explicit statement that the client is
	// authorized to inject mail with the given identity.
	ResultCodePass byte = iota

	// A result of "none" means either,
	// (a) no syntactically valid DNS domain name was extracted from the
	//     SMTP session that could be used as the one to be authorized, or
	// (b) no SPF records were retrieved from the DNS.
	ResultCodeNone

	// A "neutral" result means the ADMD has explicitly stated that it is
	// not asserting whether the IP address is authorized.
	ResultCodeNeutral

	// A "fail" result is an explicit statement that the client is not
	// authorized to use the domain in the given identity.
	ResultCodeFail

	// A "softfail" result is a weak statement by the publishing ADMD that
	// the host is probably not authorized.
	// It has not published a stronger, more definitive policy that
	// results in a "fail".
	ResultCodeSoftfail

	// A "temperror" result means the SPF verifier encountered a transient
	// (generally DNS) error while performing the check.
	// A later retry may // succeed without further DNS operator action.
	ResultCodeTempError

	// A "permerror" result means the domain’s published records could not
	// be correctly interpreted.
	// This signals an error condition that definitely requires DNS
	// operator intervention to be resolved.
	ResultCodePermError
)

type Result struct {
	IP net.IP // The IP address of sender.

	Err string

	Domain   []byte // The domain address of sender from SMTP EHLO or MAIL FROM command.
	Sender   []byte // The email address of sender.
	Hostname []byte

	Code byte // Result of check host.
	// contains filtered or unexported fields
}