[afnog] sendmail problem

[Alex Gondwe]

Stephane Bortzmeyer wrote:
> On Tue, Nov 07, 2006 at 03:42:25PM +0200,
>  Alex Gondwe <agondwe at malswitch.com> wrote 
>  a message of 12 lines which said:
>
>   
>> I have a mail server running sendmail. When the Internet connection
>> or DNS fails the server fails to receive mail from the network.
>>     
>
> It seems reasonable that no network means no email :-)
>
> Unless you mean, "when the Internet connection or DNS fails the server
> fails to receive mail EVEN from the LOCAL network." Is that so?
>   
When DNS or Internet connection fails, the server fails to receive mail 
from client machines on the Local Area Network.
> If so, your MTA probably tries to resolve the IP address of the sender
> into a name and cannot reach in-addr.arpa nameservers. (Checking the
> log file of sendmail - always the first thing to do - will allow you
> to be sure.)
>
> Check that the DNS resolver of the MTA can always resolve local IP
> addresses, even without access to the Internet. For instance, if your
> local addresses are 192.0.2.0/24, check that 2.0.192.in-addr.arpa is
> directly reachable from this resolver (either because it is
> authoritative for it or because it knows a forwarder which is).
>
>   
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