At 07:36 AM 10/5/2004, you wrote:
We are seeing a slight 30-60 second delay on incomming email, which I've tracked down to the DNS blacklist lookups. I have a couple of questions regarding how to fix this, if possible. Granted, I do have 14 rules, which I suppose I could cut back on.
1. Why aren't these queries done in parallel? Could they be? I suspect this would speed them up by a factor of 10.
Decluse supposedly does it in parrallel, Imail does not however have this ability.
2. Is 14 rules too many, or do I just have to live with a 30 delay at this number?
Do you mean that you are checking 14 blacklists or that you have 14 various options selected on Imail's antispam checks? We are using four blacklists.
3. Would caching speed this up? I have the iMail DNS cache set to 200. Does this get used for blacklists? Should I up it?
Not sure, but I would not think so.
4. Has anyone implimented some kind of caching on their local DNS server that would speed this up? We run MS DNS, not sure what the caching is like.
I know a 30-60 second delay is not that bad; email is not IM after all. However, prior to having spam filtering, it was virtually instantaneous (1-2 seconds). The clients are givin us a hard time about it, even though they love the spam filtering.
Just let your users know that this is the price for filtering.
Thanks!
-Chase
Chase Seibert | Network and Systems Engineer | Bullhorn Inc. | 617.464.2440 x119 | www.bullhorn.com
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