Issue: Host unknown (Name server: .: no data known)

In article <46bac651$0$25492$ba620dc5 [at] text.nova.planet.nl>,
"Boy Callaars" <boy [at] mrcetrac.nl> wrote:

> Hello everyone,
>
> Since today I got an issue with my sendmail. It does not send any mail
> anymore, just returning the same error over and over again.
> It does however, send internal mail.
>
> If I try to send mail to another domain like 'domain.nl' it does return
> with a bounce:
>
> [bounce begin]
>
>
> The original message was received at Wed, 8 Aug 2007 12:52:33 +0200
>
> from ws-bc [192.168.0.54] (may be forged)
>
> ----- The following addresses had permanent fatal errors -----
>
> <address [at] domain.nl>
>
> ----- Transcript of session follows -----
>
> 550 5.1.2 <address [at] domain.nl>... Host unknown (Name server: .: no data
> known)
>
> [bounce end]
>
> Since we didn't change anything to the configuration lately and nothing
> (really nothing) is to be found otherwise then this error, it doesn't become
> any clearer to me.
>
> Anyone a idea?

Your DNS seems to be broken.

If ALL mail to external domains is failing that way, it is almost surely
because you have made some change to your DNS environment such that
Sendmail can no longer get resolution of external domain names. That's
not necessarily cause by a change to Sendmail (in fact it almost surely
isn't) and may not even be due to a change on the machine Sendmail is
running on, although modifications to the resolver config or name
service switch config could cause it, as could unwise local packet
filtering.

--
Clues for the blacklisted: <http://www.scconsult.com/bill/dnsblhelp.html>

Issue: Host unknown (Name server: .: no data known)

Re: Issue: Host unknown (Name server: .: no data known)