* Marc Perkel:

> OK - I think I'm making some progress on this. I created a DNS server 
> that you can pass a $sender_host_name to and get a code indicating if 
> it's a one level or 2 level domain.

By the way, the Mozilla folks maintain something called an "effective
TLD service":

<http://wiki.mozilla.org/Gecko:Effective_TLD_Service>
<http://publicsuffix.org/>

I strongly suggest to use this data because maintaining your own will
be quite a challange.

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