[ietf-dkim] Are lookalike domains like parent domains?

[Steve Atkins]

On May 1, 2008, at 10:42 AM, Jim Fenton wrote:

>
>
>> People whose work environments consist solely of three level
>> hostnames see it as a magic bullet. Those who don't, see it as
>> a hack that adds complexity for recipients without buying the
>> senders any functionality they didn't already have via less
>> intrusive methods.
>>
>
> Intrusive?  How does this intrude?

It adds an additional network query for every email received by a  
typical receiver. That's very intrusive.

How many levels of hostnames does cisco use, as a real world example?

Cheers,
   Steve