[afnog] sendmail problem

[Peter Nyamukusa]

Hi Guys,

usually when you configure sendmail if you have a look in your sendmail.cf 
usually in /etc/mail the line below is commented out so sendmail will try to 
use DNS. unconnecting the line will make sendmail first query the /etc/hosts 
file for resolution and then DNS 

# hosts file (normally /etc/hosts)
O HostsFile=/etc/hosts

assuming that your /etc/hosts file is set up correctly sendmail will be able 
to resolve the local domain and deliver local email without the need of an 
internet connection

Regards,

Peter Nyamukusa (CCNA, MCSE, A+)


On Tuesday 07 November 2006 18:07, Joe Abley wrote:
> On 7-Nov-2006, at 09:17, Stephane Bortzmeyer wrote:
> > 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).
>
> If this doesn't fix the problem, then it's possible that sendmail is
> doing sender address verification as it accepts mail from the network
> (e.g. checking that the recipient domains exist in the DNS).
>
> I seem to remember that there's a sendmail option which causes it to
> accept and queue mail and defer those kinds of checks until the queue
> run. But it's so long since I have dared run sendmail on any machine
> in my control, I can't tell you for sure.
>
>
> Joe
>
>
>
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