NAME Mail::SpamAssassin::RegistryBoundaries - domain delegation rules METHODS ($hostname, $domain) = split_domain ($fqdn, $is_ascii) Cut a fully-qualified hostname into the hostname part and the domain part, splitting at the DNS registry boundary. Examples: "www.foo.com" => ( "www", "foo.com" ) "www.foo.co.uk" => ( "www", "foo.co.uk" ) If $is_ascii given and true, skip idn_to_ascii() conversion $domain = trim_domain($fqdn, $is_ascii) Cut a fully-qualified hostname into the hostname part and the domain part, returning just the domain. Examples: "www.foo.com" => "foo.com" "www.foo.co.uk" => "foo.co.uk" If $is_ascii given and true, skip idn_to_ascii() conversion $ok = is_domain_valid($dom, $is_ascii) Return 1 if the domain/hostname uses valid known TLD, "undef" otherwise. If $is_ascii given and true, skip idn_to_ascii() conversion. Note that this only checks the TLD validity and nothing else. To verify that the complete fqdn is in a valid legal format, Util::is_fqdn_valid() can additionally be used.