From: Lars Hansson (larsunet.net.ph)
Date: Thu Mar 02 2006 - 01:57:38 CST

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On Thursday 02 March 2006 15:14, Tobias Weingartner wrote:
> If the client can't find any DNS information on the destination, it
> tends to bounce. At least in all non-broken MTAs. Try it. Send
> email to abusefoobar-toogood.com and see what happens.
> This was 1/2 his argument. No DNS info means no DNS info. Not "somewhere
> out there" (sung like the song) we have a cache...

That's a different case though. foobar-toogood.com does not exist (NXDOMAIN)
which is entirely different from a domain that exists but the nameservers are
down or otherwise unreachable. The first case will cause immediate bounces,
the second will only bounce after the sending MTA has retried for about a
week. Only fundamentally broken MTA's will bounce immediately if namelookups
timeout.

---
Lars Hansson

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