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.
-Jim
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