> $ host sbl.spamhaus.org
> $
Use dig and you'll see that spamhaus replies to such inquiries with:
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
However, if you use a proper DNS RBL query, e.g.,
$ host 194.208.14.24.sbl-xbl.spamhaus.org
194.208.14.24.sbl-xbl.spamhaus.org has address 127.0.0.4
you'll get a valid reply.
> not sure how james behaves with the lack of response
James should only be accepting a positive response. We can do more testing
related to error conditions, but the onMatcherException attribute can tell
James what to do if there is some unexpected exception thrown.
In future versions of James, I hope that we will introduce queueing within
the spooler so that operations such as DNS lookups that fail can be
scheduled by the spooler for retrying.
--- Noel
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