Thanks for the help on sendmail, I had read a book that said if I had
the correct MX entries in my name server, then I would not need the Cw
entries in sendmail.cf, however, that has fixed the problem but:

I am still havein problems with DNS, when I run dnslookup, I get NON
authoritative replies from my nameserver, which is supposed to be
authoritative. I don'n know why... I have set the zonefile to be a
master in my named.conf (using Bind8, shipped with SuSE 6.3).

Here is the DNSlookup reply

Default Server:  maggie.instrumental-it.com
Address:  203.42.218.121

> set type=any
> emseng.com.au
Server:  maggie.instrumental-it.com
Address:  203.42.218.121

Non-authoritative answer:
emseng.com.au   preference = 10, mail exchanger =
maggie.instrumental-it.com
emseng.com.au   nameserver = maggie.instrumental-it.com
emseng.com.au   nameserver = ns1.telstra.net
emseng.com.au
        origin = maggie.instrumental-it.com
        mail addr = root.maggie.instrumental-it.com.(.emseng.com.au
        serial = 5
        refresh = 0 (0S)
        retry   = 10800 (3H)
        expire  = 0 (0S)
        minimum ttl = 900 (15M)

Authoritative answers can be found from:
maggie.instrumental-it.com      internet address = 192.168.0.1
maggie.instrumental-it.com      internet address = 203.42.218.121
ns1.telstra.net internet address = 139.130.4.5


and here is my naed.conf

/* sample configuration file for BIND 8.1 or later
 * should be installed as /etc/named.conf
 *
 * Author: Florian La Roche
 */

#
# overall options of the server
#
options {
        directory "/var/named";
        # the default is to fail, if the master file is not correct
        check-names master warn;

        pid-file "/var/run/named.pid";

        datasize default;
        stacksize default;
        coresize default;
        files unlimited;
        recursion yes;

        multiple-cnames no;             // if yes, then a name my have
more
                                        // than one CNAME RR.  This use
                                        // is non-standard and is not
                                        // recommended, but it is
available
                                        // because previous releases
supported
                                        // it and it was used by large
sites
                                        // for load balancing.

        # the default is to ask the forwarders and if they fail
        # try to find the answer yourself, this will only ask the
forwarders
        #forward only;
        # list of DNS servers to ask
        #forwarders {
        #       192.168.0.10;
        #       192.168.0.20;
        #       192.168.0.30;
        #};
        # the default is to listen on port 53 on all available
interfaces
        # you can also give a detailed list:
        #listen-on { 5.6.7.8; };
        #listen-on port 1234 { !1.2.3.4; 1.2/16; };
};

#
# do not be verbose about these problems...
#
#logging {
#       category lame-servers { null; };
#       category cname { null; };
#};

#
# predefined access control lists (acl):
# "any"         allows all hosts
# "none"        denies all hosts
# "localhost"   allows the IP adresses of all interfaces of the system
# "localnets"   allows any host on a network of the local interfaces
#
# defining an additional ACL:
#acl can_download { 192.168.0.17; 192.168.0.18; };
#acl any;

#
# The server statement defines the characteristics to be associated with
# a remote name server.
#
# Marking a server as bogus will prevent queries to that server.
#server 192.168.0.128 { bogus yes; }
# If the other name server has also BIND 8.1 or newer installed, you
# can allow compacter zone transfers with this statement.
#server 192.168.0.128 { transfer-format many-answers; }

zone "." IN {
        type hint;
        file "root.hint";

};

zone "localhost" IN {
        type master;
        file "localhost.zone";
        check-names fail;
        allow-update { none; };
};

zone "0.0.127.in-addr.arpa" IN {
        type master;
file "127.0.0.zone";
        check-names fail;
        allow-update { none; };
};


zone "0.168.192.in-addr.arpa" IN {
        type master;
        file "192.168.0.zone";
        check-names fail;
        allow-update { none; };
};

zone "218.42.203.in-addr.arpa" IN {
        type master;
        file "203.42.218.120.zone";
        check-names fail;
        notify yes;
        allow-update { none; };
        allow-transfer {139.130.4.5};

};

#
# Instrumental IT zone
#
zone "instrumental-it.com" IN {
        type master;
        file "instrumental-it.zone";
        notify yes;
        allow-update {none};
        allow-transfer {139.130.4.5};
        notify yes;
};

#
# EMS Eng zone
#
zone "emseng.com.au" IN {
        type master;
        file "emseng.com.au.zone";
        allow-update {none};
        allow-transfer {139.130.4.5};
        notify yes;
};
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