Marc,
Can you please confirm which of the hub.org DNS servers do and do not
allow recursion now, and if things are going to stay that way? We're
finding that some things appear to have broken recently, apparently
because they no longer have a suitable DNS server configured (rsync
access via hostname on svr4, email address validation on wwwmaster).
A quick test shows that ns, ns2 and ns4 are recursive, but ns3 is not at
present.
Cheers, Dave.