[rbldnsd] queries of non-existent RRs

[Steven F Siirila]

I am curious as to why rbldnsd returns a "temporary error" instead of a
"not found" error when looking up a non-existent RR.  This makes sense
for a zone in which rbldnsd did not load, but not for ones it did load.
For example, if I query for 2.0.0.127.sbl.spamhaus.org, I get an answer.
However, if I query for 1.0.0.127.sbl.spamhaus.org, I get a temporary
error.  The only way to "fix" this is to ensure use of "forward first"
in the BIND forward zone pointing to my local rbldnsd.  While I want to
be configured in this manner, it seems counterproductive to query the
real sbl.spamhaus.org zone for every IP address which is not listed in
rbldnsd.
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