Potential domain name conflict between name server and sendmail

Local domain names and domain name servers are specified in different files, depending on whether the host is a DOMAIN name server.

For a host that is in a DOMAIN network but is not a name server, the local domain name and domain name server are specified in the /etc/resolv.conf file. In a DOMAIN name server host, the local domain and other name servers are defined in files read by the named daemon when it starts.