[26513] in North American Network Operators' Group
Re: mail does bounce (was: Customers down?)
daemon@ATHENA.MIT.EDU (jlewis@lewis.org)
Sun Jan 2 01:28:15 2000
Date: Sun, 2 Jan 2000 01:26:55 -0500 (EST)
From: jlewis@lewis.org
To: Sean Donelan <sean@donelan.com>
Cc: nanog@merit.edu
In-Reply-To: <20000102042735.3381.cpmta@c004.sfo.cp.net>
Message-ID: <Pine.LNX.4.10.10001020121470.1229-100000@redhat1.mmaero.com>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Errors-To: owner-nanog-outgoing@merit.edu
On 1 Jan 2000, Sean Donelan wrote:
> On Sat, 01 January 2000, "Steven J. Sobol" wrote:
> > What I was referring to was a situation where the domain does exist in the
> > root nameservers but the authoritative nameservers are unavailable.
>
> So .COM exists in the root servers? How do you decide to treat second
> level domains (i.e. donelan.com) versus third level domains
> (i.e. www.donelan.com) versus third level domains under country code
> domains.
Sendmail is smart enough to distinguish between a DNS lookup timing out
(authoratative name servers unreachable) and getting an nxdomain response
(authoratative name server says host doesn't exist). In the first case,
the message is queued and delivery retried periodically. In the second,
the message bounces.
----------------------------------------------------------------------
Jon Lewis *jlewis@lewis.org*| Spammers will be winnuked or
System Administrator | nestea'd...whatever it takes
Atlantic Net | to get the job done.
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