Michael Thomas wrote:
> 1) The benefits in general

Consolidation of multiple domains to a single key record.  Useful when
contracting out signing, wouldn't you think?

> 2) The security implications of the base DKIM mechanism (ie, is the
> delegation
>    model still correct, what about key rollover, etc, etc).

You own the domain.  If you CNAME over to somebody else you're trusting
them.
> 3) The unintended security implications (loops, dos, amplification...)

Dunno.  Mark's points apply.

Eliot
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