Can someone tell me what a default or 'good' /etc/resolv.conf should look like?
I ask because we were observing lots of failures (timeouts) in exim_mainlog when our server was trying to connect and send mail to other mail servers. It was eventually tracked down to an incorrect config of resolv.conf (nameserver 127.0.0.1 was missing, no idea why).
So I'm assuming therefore that nameserver 127.0.0.1 in resolv.conf is essential? What else is essential or recommended?