> But the protocol allows the bulk mailer to create any key records
> they like and the protocol as it is written today means that they
> are treated by the infrastructure as equivalent.

I suppose the bulk mailer could forge mail from [EMAIL PROTECTED] and
sign it with d=email.orbitz.com, but I don't see why that's any
different from signing it with d=doubleclick.com or any other domain
they control.  The dkim-base treats all d= the same, regardless of
the DNS structure.

What security issue does subdomain delegation introduce here?

R's,
John

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