Is this on a Windows 2003 Server using MS DNS? If so, search the archives for the root of the problem.
John Tolmachoff Engineer/Consultant/Owner eServices For You > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:IMail_Forum- > [EMAIL PROTECTED] On Behalf Of Chase Seibert > Sent: Tuesday, October 05, 2004 7:37 AM > To: [EMAIL PROTECTED] > Subject: [IMail Forum] DNS Blacklist Speed > > > > 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. > 2. Is 14 rules too many, or do I just have to live with a 30 delay at this number? > 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? > 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. > > Thanks! > > > > > -Chase > > Chase Seibert | Network and Systems Engineer | Bullhorn Inc. | 617.464.2440 > x119 | www.bullhorn.com To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
