What is the syntax to tell Declude to use a DNS server in the Global.cfg Fred ----- Original Message ----- From: "R. Scott Perry" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Thursday, February 26, 2004 6:24 PM Subject: Re: [Declude.JunkMail] DNS timeout and DNS configuration - does it get logged?
> > >In diagnosing why some messages are slipping through, I manually analyzed > >the headers using spamcop and noticed that spamcop reported a blacklist > >that wasn't getting scored by declude. > > > >I'm assuming the problem is a DNS timeout when declude is trying to > >perform the lookup test. > > Either that, or a dropped packet. It's also possible that the IP was added > after Declude JunkMail performed the lookup, but before you looked it up > manually. > > >I'm changing the DNS servers used by declude but wondering: > > > >1. Is there a way to confirm which DNS server declude is using? I know it > >either inherits the imail server or used the "DNS..." config line, but is > >there a status that shows what it actually is using? > > With the latest beta, typing "\IMail\Declude -diag" from a command prompt > will display the DNS server that is being used. > > >2. What is the algorithm? does declude use primary DNS and then secondary > >DNS also? When a DNS lookup fails, does it retry the same server, switch > >to the secondary DNS server, or simply move on to the next test? > > Given the IMail architecture, Declude JunkMail always uses the first DNS > server listed in the IMail SMTP settings (unless you override this with a > DNS line in the \IMail\Declude\global.cfg file). Note that it is > recommended (with or without Declude) that you only use 1 DNS server in the > IMail SMTP settings. > > >3. How does DNS caching affect declude? Should we install a "caching-only > >DNS server and configure it as declude's primary lookup server? Will > >caching actually cause problems with stale data or help performance? > > The DNS caching is automatic -- you don't need to worry about it, the DNS > server will automatically cache the DNS entries, no matter how you have it > set up (unless you either have a very odd DNS server, or tweak it in a way > that it shouldn't be tweaked). > > The reason that you don't need to worry about it is that the spam databases > decide how long the entries should be cached. > > >4. Any general advice on monitoring DNS lookups? Obviously, if DNS is > >failing it will make declude work poorly. > > DNS is nice, as it rarely ever fails. As a comparison, we have a custom > programmed web server (not using IIS) that hangs at about every 100,000 > hits. We have a custom programmed DNS server that has handled many > millions of hits without hanging even once. > > -Scott > --- > Declude JunkMail: The advanced anti-spam solution for IMail mailservers > since 2000. > Declude Virus: Catches known viruses and is the leader in mailserver > vulnerability detection. > Find out what you've been missing: Ask for a free 30-day evaluation. > > --- > [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] > > --- > This E-mail came from the Declude.JunkMail mailing list. To > unsubscribe, just send an E-mail to [EMAIL PROTECTED], and > type "unsubscribe Declude.JunkMail". The archives can be found > at http://www.mail-archive.com. > --- [This E-mail was scanned for viruses by Declude Virus (http://www.declude.com)] --- This E-mail came from the Declude.JunkMail mailing list. To unsubscribe, just send an E-mail to [EMAIL PROTECTED], and type "unsubscribe Declude.JunkMail". The archives can be found at http://www.mail-archive.com.
