OT: Invalid domain name during SMTP test

René Berber r.berber at computer.org
Tue Sep 12 22:29:56 IST 2006

Billy A. Pumphrey wrote:

>> -----Original Message-----
>> Do you have split DNS?
>> Nate
> If I understand what split DNS is, yes I do.  The DNS is configured to
> resolve with the local Windows DNS server, then if the windows server
> does not know the lookup, it will query the internet.

No, split view DNS means you see a local IP address from your LAN and you see the Internet address from outside (for the name of your mail server).  

The above comment probably means that you can see different names too, but it makes no sense to me, something like server.domain.local from inside and just server.domain from outside... for the same IP address?

Anyway, the original problem is probably in /etc/hosts or hostname, not in DNS.  You have to see where your mail server gets its name from, with sendmail the commands:

echo '$=R' | sendmail -bt -d0.10

will show you the name (Canonical name) and domain info among other things.
René Berber

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