CAA iodef clarification

[Tony Finch]

rams <bramesh80 at gmail.com> wrote:
>
> On the CAA record iodef filed, do we force this to be unique or can it
> match a CNAME?

The specification says the iodef field contains a URL so normal URL
resolution applies.

https://tools.ietf.org/html/rfc8659#section-4.4

Questions about CNAMEs are at the wrong layer. HTTP URLs can refer to
CNAMEs; email addresses only use CNAMEs if you like tackling
interoperability problems dating from the 1980s.

Tony.
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