My guess is that the proposal wants to include wildcards, but if that's
the case I think that's not a great tradeoff, nor does it address anything
smaller than /24 delegations (e.g. RFC2317). Besides, one could always
handle the /24 wildcard entry in another way, such as:
$ORIGIN 0.0.10.in-addr.arpa.
; default txt record(s) for this zone
mta IN TXT "no"
; specifics per IP
1 IN PTR mail.example.com.
mta.1 IN TXT "yes"
contact.mta.1 IN TXT "mailto:abuse(_at_)example(_dot_)com"
Or even:
$ORIGIN 0.0.10.in-addr.arpa.
; defaults
*.mta IN TXT "no"
*.contact IN TXT "mailto:abuse(_at_)example(_dot_)com"
; specifics per IP
1 IN PTR mail.example.com.
1.mta IN TXT "yes"
1.contact IN TXT "mailto:abuse-1(_at_)example(_dot_)com"
mm
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