[Cialug] Cannot retrieve mail through internal nework

[Chris Van Cleve]

I decided to rebuild an old 1.2 GHz P4 box as a linux server to host  
my family web site and email. Since I was in an adventurous mood, I  
installed Ubuntu to try it out. (Love it, btw. Finally a usable  
Debian. ;) ) I am having two problems with it though, one of which  
I'm hoping the Linux Geniuses here can help me figure out.

The box is running Postfix because I'm used to it, and I think it's  
the best mail server. It's working flawlessly. My router is  
configured to forward ports 25 and 110 to that box. Using Webmin, I  
am able to send an receive email just fine. Everything sounds good,  
right? Here's the catch:

I have 4 other PCs on my home network, all of which are configured to  
use my home domain for email. None of these machines, through various  
clients, is able to connect to the Ubuntu box. I am getting denial  
messages for port 110 and port 25 when trying to receive/send mail  
respectively. I thought at first it was a resolution problem (and  
spent a good chunk of time playing with host files), but all 4 PCs  
correctly reach the box's webmin interface using the domain name.

Any ideas?

Chris VC
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