Ok scowles and maxut, thanks for hanging with me on this. After I make the changes to the sendmail.mc file to look like this:

DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=192.168.1.69, Name=MTA')dnl

Then I simply WriteOut the file, save it and restart sendmail?

That's correct! Just so long as 192.168.1.69 is your systems eth0 IP address.

I finally got this working correctly. The solution, for me anyway, was to make the change in the sendmail.cf file not the sendmail.mc file. I simply entered the LAN IP address in place of the loopback address. I then did the 'service sendmail restart'. Thanks for all the help.

I've been following this thread closely because I too am attempting to set up a mail server on my linux box. My current problem seems to be that my sendmail is not listening on port 25. I am running my linux box 24/7 behind a router (192.168.0.140) with my linux box being 192.168.0.138.

I _believe_ I have most of my settings correct. Without adding pages and pages of configuration files, sendmail is running; iptables is accepting everything; sendmail.mc has DAEMON_OPTIONS set to 0.0.0.0, local LAN IP, and WAN IP; eth0 set to WAN IP; etc. After making changes suggested in this thread, I've restarted programs and the computer.

I can ssh to the linux box from other machines, it is serving web pages both LAN and WAN, so I know there's a connection to the outside world.

Running netstat tells me that there are all sorts of tcp port connections, but not port 25. Attempting to send user-to-user mail with pine gives an error sending "Connection failed to WAN_IP,25: Connection refused".

Is this enough to suggest what my problem is? Am I missing something obvious to someone else?

Bucky