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http://www.exim.org/bugzilla/show_bug.cgi?id=488 ------- Comment #7 from [EMAIL PROTECTED] 2007-03-22 18:16 ------- [EMAIL PROTECTED] wrote: > ------- You are receiving this mail because: ------- > You reported the bug, or are watching the reporter. > > http://www.exim.org/bugzilla/show_bug.cgi?id=488 > > > > > > ------- Comment #6 from [EMAIL PROTECTED] 2007-03-22 17:57 ------- > On Thu, 2007-03-22 at 13:19 +0000, [EMAIL PROTECTED] wrote: > >> OK - this might be a way to simulate the problem. Set your /etc/resolv.conf >> in >> the Exim server to some local caching name server that you control. Pick a >> test >> domain and look up the name server BS records. hen on the name server machine >> run this: >> >> iptables -v -I INPUT -s ns1.domain.com -j DROP >> iptables -v -I INPUT -s ns2.domain.com -j DROP >> >> I hope this code is right. The idea being that you block your resolving name >> server from accessing the name servers of the domain that you are emailing. >> That's what happened to me. Due to the routing problem my nameservers >> couldn't >> rote to the name servers of the destination and because it was cut off mail >> bounced instantly as unroutable. >> > > And quite right too. If the lookups for the domain timeout completely, > how do your resolvers (and by extension Exim, or any other application > relying on DNS) know that it's a network problem? > > If you can't lookup the records for a domain *regardless of the reason*, > the domain becomes unrouteable. Hence the error condition. > > DNS is, after all, the application-layer glue that holds stuff like SMTP > together. Without it, we're back in the dark ages! > > I still don't think this is a bug. > > Graeme > I'm not sure that I would say that it's not a bug. There might not be an easy way to resolve it. It might be something we have to live with if we can't distinguish between a valid domain with DNS problems and an invalid domain. But - I thought I'd bring it to your attention in case it could be fixed. -- Configure bugmail: http://www.exim.org/bugzilla/userprefs.cgi?tab=email -- ## List details at http://www.exim.org/mailman/listinfo/exim-dev Exim details at http://www.exim.org/ ##
