On Wed, Feb 06, 2002 at 11:04:56AM +0100, Fred Inklaar wrote:

> So, I thought timing could be a problem, so I tried to get some IP-numbers
> reversed and got mostly the following two errors replied for unknown host
> names:
>
> Host 20.25.243.207.in-addr.arpa not found: 3(NXDOMAIN)

This results in the mail being blocked

> Host 20.25.242.207.in-addr.arpa not found: 2(SERVFAIL)

This causes a temporary failure.

> That's OK, and those hostnames should be rejected. Once in a while however,
> I get the response:
>
> ;; connection timed out; no servers could be reached
>
> Which just means (I presume) that my ISPs name servers were overloaded with
> requests, and that the name could not be resolved within the specified time.

Yup. Install a local caching DNS.

-- 
Ralf Hildebrandt (Im Auftrag des Referat V A)   Ralf.Hildebrandtcharite.de
Charite Campus Virchow-Klinikum                 Tel.  +49 (0)30-450 570-155
Referat V A - Kommunikationsnetze -             Fax.  +49 (0)30-450 570-916
To rephrase, spam is not the answer. Spam is the question. Death is
not the answer, but pretty close to it. 
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