Mail::SpamAssassin::RegistryBoundaries - domain delegation rules
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
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
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.