Hi - ok I'm trying to get my linux machine to dump it's email onto my works email server and thus onto the outside world. I have a valid email address on the server BUT for the life of me I can't seem to configure SENDMAIL without getting "The email could not be delivered because you (root@xx.co.uk) are trying to send email from an uregistered email host"

I have been told to look at something called the null.mc file and I've put a root map in the genericstable file. rehashed the map but still nothing...

help me before I loose the will to live.