Exchange 2003 - Cannot receive mail anymore

Hey

Had a working setup like this

Internet (80.62.xx.xx) => Router (NAT) => Exchange Server
(192.168.1.12)

This worked fine. But then my firewall/router was fried in a thunder
storm :(

Ok. I then added another Network card to the Exchange and enabled
DHCP, DNS and NAT so my setup now is:

Internet => Exchange Server (WAN NIC 1- 80.62.xx.xx) & (LAN NIC 2 -
192.168.1.12).

Now the client goes thorugh the Exchange server 2003 which is now also
a router. This works. But now i cannot receive mails anymore. I know
may a-record/mx records are correct since they worked before I changed
my internal setup. My SMTP is working fine (i can send mails).

The Exhange server Queue is completly empy. The funny thing is that
when i send mails to the server i never get a error mail back. (I can
send mails internal in the exchange server).

I have no idea how to "troubleshoot" this issue. Any ideas?

.

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