On Tue, Jun 17, 2008 at 08:32:15PM +0200, chris+lists@chrissearle.org wrote: > On Tue, Jun 17, 2008 at 01:37:59PM -0300, Eduardo M KALINOWSKI wrote: > > On Tue, 17 Jun 2008 17:34:02 +0200, chris+lists@chrissearle.org > > (chris+lists@chrissearle.org) wrote: > > >I have exim4 (exim4-daemon-heavy) running on etch. > > > > > >This machine has only a few users who send directly. One of them has > > >an ISP who seems to have a broken DNS setup. > > > > > >The symptom I see is that when this user connects to the server (port 25 > > >or 587) there is a large delay before the 220 banner is shown e.g.: > > > > > >[snip] > > > > > >Is it possible to whitelist a range or turn off the check? > > > > There is a debconf option that minimizes DNS lookups. It should solve > > this problem, but it might disable the lookups also in places where > > you might want them. > > OK - just tried that. Seems to set the host_lookup to empty instead of * > and yes - the 220 banner is now instant. > > I wonder if there is a way to say that host_lookup is everything except > a range though? It would be great to be able to say all hosts except the > IPs in this ISP's dial up ranges. I think you can do that directly in the exim.conf file, but that would more or less require a handwritten file. It's not that hard, but definitely an order of magnitude more difficult than using debconf. There may be a way to add additional lines to the debconf config as well, which would help. You should read the exim documentation (heh) for more details. A
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