get domain component from email

Hi all. Im looking for a way to get the domain from an email address. Not sub domains, just the domain, so luser@foo.bar.example.com.mn would return example.com.mn similarly, the address luser@example.com would return example.com perhaps an array of tld's, then strip the tld off the end and anything before that and the next "." is the domain? also, somebody told me .co.uk was a tld, but I cannot see it listed http://www.iana.org/root-whois/index.html Kind regards Kevin -- "Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote."