[ietf-dkim] Are subdomains like parent domains?
fenton at cisco.com
Thu May 1 10:31:02 PDT 2008
Al Iverson wrote:
> So, a potential way to address this without any sort of "tree walking"
> functionality would be:
> - As a sender, publish ADSP records for all domains/zones/fqdns you know about
> - Recommend that receivers reject mail from non-existing FQDNs used in
> PRA or MFROM (or somesuch).
> This seems workable. Others who prefer treewalking functionality, why
> does this not work for you? Where does this specifically fall down?
Considering that "domains you know about" includes everything with an A
record, the "publish ADSP records for all" part may not be practical for
domains with tens of thousands of hosts without new DNS tools.
There's also the question of what constitutes a non-existing FQDN
(NXDOMAIN? MX/A/AAAA all fail?) and whether that check should be
included in ADSP but that's covered in another thread.
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