smtp not accepting incoming msgs

[lazynewt]

Hi im new to exchange. i recieved a pre-configured echange server that isnt really setup. i have setup outgoing smtp connector to route through my isp and that works fine. The issue im having is that the pop3 connector im using is downloading msgs fine but when it sends them to my smtp (on same machine) they are bounced showing error 5.0.0 . I have a feeling that this is something to do with either my ip/subnet settings or dns settings. I am using the router bewteen the server and the internet as the dns. 192.168.1.254 . Also from what i understand my wan and lan ip need to be on different subnets?? is that right? and would this affect it? heres my ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : server
Primary Dns Suffix . . . . . . . : mydomain.local
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : mydomain.local

Ethernet adapter lan:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 S Desktop Adapter #2
Physical Address. . . . . . . . . : 00-02-B3-4C-1B-22
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.1.252
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.254
DNS Servers . . . . . . . . . . . : 192.168.1.254

Ethernet adapter wan:

Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Intel(R) PRO/100 S Desktop Adapter
Physical Address. . . . . . . . . : 00-02-B3-4C-08-63
DHCP Enabled. . . . . . . . . . . : No
IP Address. . . . . . . . . . . . : 192.168.1.253
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.254
DNS Servers . . . . . . . . . . . : 192.168.1.254

 

[lazynewt]

ok if i change my wan dns address to my lan nics ip i can see the message que in exchange. im pretty sure i have a dns or ip issue any ideas??