I would setup dnscache on your mail server (I run it on one of mine with 
about 5,000 users and 1,000 or so vhosts, so load shouldn't be an issue) 
following this document : http://cr.yp.to/djbdns/run-cache.html

Let me know if this helps


On Tuesday 18 November 2003 12:31 pm, Russell Mann wrote:
> Hello,
> Vpopmail 5.3.27
> Qmail 1.03
> patch < doublebounce-trim.patch
> patch < qmail-remote.diff
> patch < qmail-local.diff
> patch < qmail-1.03-mfcheck.3.patch
> patch < nullenvsender-recipcount.patch
> patch < sendmail-flagf.patch
> patch < qmail-maildir++.patch
> patch < qmail-queue.patch
> I'm getting the CNAME lookup failed temporarily error for earthlink.net
> addresses.  I've read this:
> http://web.infoave.net/~dsill/lwq.html#dns-patches
> ------------------
> dnscache is, as the name implies, a caching DNS server. It knows how to
> handle large DNS responses and generally improves DNS lookup performance
> for all services that use DNS. Because it doesn't require patching qmail,
> this is by far the best solution. See the djbdns section under Related
> Packages for more information.
> ------------------
> Question I have is what if I don't own the DNS server?  I'm using an
> /etc/resolv.conf file to point to my Colo companies DNS server.
> Maybe I don't understand something?
> Thanks,
> Russell

Derek Fedel
Network Administrator
Ext. 238

"Hence the saying:  If you know the enemy 
and know yourself, you need not fear the result of a 
hundred battles.  If you know yourself but not the enemy, 
for every victory gained you will also suffer a defeat.  
If you know neither the enemy nor yourself, you will 
succumb in every battle." - Sun Tzu

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