Configuring router

[h3llh0l3]

Hello all,

I am not sure if this should be posted here or not but I could use some help.
I have installed ubuntu hardy and for some testing I have configured postfix.
I have a router facing the internet and I am having hard time configuring the router to allow traffic on port 25 to my server. I have a BCM96338 ADSL Router. I have set iptable rules to allow the traffic on port 25 on the router. When I do a telnet localhost 25 it connects to the smtp server, but if I try telnet xxx.xxx.xxx.xxx 25 from another computer on the LAN or from different network it does not connect.
Here is how my iptables rule look like:
xxx.xxx.xxx.xxx -> IP Address of my linux machine



Chain FORWARD (policy ACCEPT)
target prot opt source destination
ACCEPT tcp -- anywhere xxx.xxx.xxx.xxx tcp dpt:smtp

Chain PREROUTING (policy ACCEPT)
target prot opt source destination
DNAT tcp -- anywhere anywhere tcp dpt:smtp to:xxx.xxx.xxx.xxx


Could some one please point into the right direction to fix this.

Thanks :)

[h3llh0l3]

Anyone any ideas?
Help would be really appreciated.

Thanks.