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Posted to dev@spamassassin.apache.org by bu...@bugzilla.spamassassin.org on 2005/04/08 21:02:22 UTC

[Bug 3500] RFE: allow specification of nameserver for RBL queries

http://bugzilla.spamassassin.org/show_bug.cgi?id=3500





------- Additional Comments From gurnec@gis.net  2005-04-08 12:02 -------
Request to reopen....

In the case where an RBL cache (ex. rblndsd) is running on the same machine as 
a general purpose DNS cache (bind, dnscache, etc.), possibly all on a 
dedicated SpamAssassin server, it can be considerably more memory-efficient to 
bypass the DNS cache for RBL queries. Without this feature:

1. SA sends query to DNS-cache
2. DNS-cache sends query to RBL-cache
3. DNS-cache caches the result from RBL-cache

The result being that both caches now have the record stored in RAM. If the 
DNS cache is dedicated to SpamAssassin, it will quickly fill with ubiquitous 
RBL cache entries leaving little room for other entries. This can be is a 
significant issue for medium/high-volume sites....

I have a patch against 3.0.2 if anyone's interested...



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