Screen OS

As the title explains I have a SSG 5 up and running but no internet access from my clients.
I see that the SSG5 has connected to my ISP cause i see my fixed ip but i cannot access internet.
I'm kinda desperate so i posted the config file and maybe you guys here can help me out.
there should also be an extra policy to route my mail traffic to my server, if you guys could check this one out

Many thanks upfront

config file: 

set clock timezone 0
set vrouter trust-vr sharable
set vrouter "untrust-vr"
exit
set vrouter "trust-vr"
unset auto-route-export
exit
set alg appleichat enable
unset alg appleichat re-assembly enable
set alg sctp enable
set auth-server "Local" id 0
set auth-server "Local" server-name "Local"
set auth default auth server "Local"
set auth radius accounting port 1646
set admin name "netscreen"
set admin password "nKVUM2rwMUzPcrkG5sWIHdCtqkAibn"
set admin port 8900
set admin auth web timeout 10
set admin auth dial-in timeout 3
set admin auth server "Local"
set admin format dos
set zone "Trust" vrouter "trust-vr"
set zone "Untrust" vrouter "trust-vr"
set zone "DMZ" vrouter "trust-vr"
set zone "VLAN" vrouter "trust-vr"
set zone "Untrust-Tun" vrouter "trust-vr"
set zone "Trust" tcp-rst
set zone "Untrust" block
unset zone "Untrust" tcp-rst
set zone "MGT" block
set zone "DMZ" tcp-rst
set zone "VLAN" block
unset zone "VLAN" tcp-rst
set zone "Untrust" screen tear-drop
set zone "Untrust" screen syn-flood
set zone "Untrust" screen ping-death
set zone "Untrust" screen ip-filter-src
set zone "Untrust" screen land
set zone "V1-Untrust" screen tear-drop
set zone "V1-Untrust" screen syn-flood
set zone "V1-Untrust" screen ping-death
set zone "V1-Untrust" screen ip-filter-src
set zone "V1-Untrust" screen land
set interface "ethernet0/0" zone "Untrust"
set interface "ethernet0/1" zone "DMZ"
set interface "bgroup0" zone "Trust"
set interface bgroup0 port ethernet0/2
set interface bgroup0 port ethernet0/3
set interface bgroup0 port ethernet0/4
set interface bgroup0 port ethernet0/5
set interface bgroup0 port ethernet0/6
unset interface vlan1 ip
set interface ethernet0/0 ip 172.23.0.24/23
set interface ethernet0/0 route
set interface bgroup0 ip 192.168.1.254/24
set interface bgroup0 route
unset interface vlan1 bypass-others-ipsec
unset interface vlan1 bypass-non-ip
set interface ethernet0/0 ip manageable
set interface bgroup0 ip manageable
set interface ethernet0/0 manage ping
set interface ethernet0/0 manage web
set interface bgroup0 manage mtrace
set interface ethernet0/0 dhcp client enable
set interface ethernet0/1 dhcp client enable
set interface bgroup0 dhcp server service
set interface bgroup0 dhcp server auto
set interface bgroup0 dhcp server option gateway 192.168.1.254
set interface bgroup0 dhcp server option domainname telenet.be
set interface bgroup0 dhcp server option dns1 195.130.132.107
set interface bgroup0 dhcp server option dns2 195.130.137.10
set interface bgroup0 dhcp server ip 192.168.1.180 to 192.168.1.199
unset interface bgroup0 dhcp server config next-server-ip
set interface "serial0/0" modem settings "USR" init "AT&F"
set interface "serial0/0" modem settings "USR" active
set interface "serial0/0" modem speed 115200
set interface "serial0/0" modem retry 3
set interface "serial0/0" modem interval 10
set interface "serial0/0" modem idle-time 10
set flow tcp-mss
unset flow tcp-syn-check
unset flow tcp-syn-bit-check
set flow reverse-route clear-text prefer
set flow reverse-route tunnel always
set domain telenet.be
set pki authority default scep mode "auto"
set pki x509 default cert-path partial
set dns host dns1 195.130.130.130 src-interface ethernet0/0
set dns host dns2 195.130.130.131 src-interface ethernet0/0
set dns host dns3 0.0.0.0
set address "Trust" "LAN_192.168.1.0/24" 192.168.1.0 255.255.255.0
set ike respond-bad-spi 1
set ike ikev2 ike-sa-soft-lifetime 60
unset ike ikeid-enumeration
unset ike dos-protection
unset ipsec access-session enable
set ipsec access-session maximum 5000
set ipsec access-session upper-threshold 0
set ipsec access-session lower-threshold 0
set ipsec access-session dead-p2-sa-timeout 0
unset ipsec access-session log-error
unset ipsec access-session info-exch-connected
unset ipsec access-session use-error-log
set vrouter "untrust-vr"
exit
set vrouter "trust-vr"
exit
set url protocol websense
exit
set policy id 1 from "Trust" to "Untrust"  "LAN_192.168.1.0/24" "Any" "ANY" nat src permit log
set policy id 1
exit
set policy id 2 from "Untrust" to "Trust"  "Any" "VIP(ethernet0/0)" "MAIL" permit log
set policy id 2
exit
set nsmgmt bulkcli reboot-timeout 60
set ssh version v2
set config lock timeout 5
unset license-key auto-update
set snmp port listen 161
set snmp port trap 162
set vrouter "untrust-vr"
exit
set vrouter "trust-vr"
set add-default-route vrouter "untrust-vr"
exit
set vrouter "untrust-vr"
exit
set vrouter "trust-vr"
exit

I can see that you don,t have a default route pointing to the internet

set route 0.0.0.0/0 interface ethernetX/X gateway Y.Y.Y.Y

 eX/X: Interface connected to the ISP

Y.Y.Y.Y: Ip of the ISP  router connected to the firewall  ( your next hop )

Also I can see that you are doing source natting using the inteface e0/0 ip which is not a real IP ( 172.23.0.24/23)

*******************  Mark My Post as Accepted if it solved your problem*******************

now i managed to get on the internet before i applied your solution whti the config i posted.

but now i'm having a different problem.  i can only connect to my ssg5 with dchp, cause when i need to fill in the dns i don't know what to fill in. and it gets lost cause the dns isn't responding.

now the case is that my ssg5 is connected to my cable modem which is getting an static ip from my isp.

i've connected my ssg5 to my cable modem.  to my ssg5 there's a windows Server2008 which need to give a static ip for dns server purposes. that's whare i get lost.

so the internet thing has become a partially solved problem, i can connect but only through dhcp.

perhaps something isn't right with the DNS settings.

any ideas?