On Tuesday, July 27, 2004, 1:07:50 PM, Rob McEwen wrote:
sm said:
If the DNS server is slow, it will cause problems. If you are going to use DNS based blacklists, you should have a reliable DNS server.
While I generally agree with this statement, I would add that that reliability and speed are not always a "yes/no", or "good/bad" thing. There are some grey areas or varying degrees of responsiveness and speed and, definitely, using blacklists in the way that SURBL does puts a new level of burden or stress on DNS servers.
[...]
Therefore, many DNS server situations which are more than adequate for regular situations may not be adequte for SURBL lookups.
Rob McEwen
Hi Rob, It would be interesting if you could supply some measurements about the relative DNS loads caused by SURBLs and other RBLs.
If you're using SpamCopURI be sure to use a recent version (0.13 or later) since it has per query DNS result caching.
I agree a fast name server is desirable, which is why we recommend rbldnsd as fast, small and reliable. It may be posix/unix/linux/bsd only.
Jeff C.