what am I missing, getting SMTP to work

[Mike Rambour]

  I am configuring a new machine and I can't get it to work.  I am using 
Core1, all the patches and Postfix.  I am trying to use my Linux box as a 
outgoing mail server from home and not use my ISP's SMTP, I can send mail 
from the Linux machine but not from my home machines (another Linux for me 
and Windows for my wife and daughter).

   the output of nmap is (From work to home not the same net) says smtp is 
Closed but I cant figure out why:
PORT   STATE  SERVICE
21/tcp open   ftp
22/tcp open   ssh
25/tcp closed smtp
80/tcp open   http

   my iptables looks like this
ACCEPT     all  --  anywhere             anywhere           state 
RELATED,ESTABLISHED
ACCEPT     tcp  --  anywhere             anywhere           state NEW tcp 
dpt:smtp
ACCEPT     tcp  --  anywhere             anywhere           state NEW tcp 
dpt:http
ACCEPT     tcp  --  anywhere             anywhere           state NEW tcp 
dpt:ftp
ACCEPT     tcp  --  anywhere             anywhere           state NEW tcp 
dpt:ssh
REJECT     all  --  anywhere             anywhere           reject-with 
icmp-host-prohibi

  I am using postfix and ps output says
root      1735  0.0  0.4  7140  620 ?        S    Apr14   0:00 sendmail: 
accepting connections
smmsp     1744  0.0  0.3  7316  412 ?        S    Apr14   0:00 sendmail: 
Queue runner at 01:00:00 for /var/spool/clientmqueue

  I am guessing my problem is smtp being closed according to nmap. I did 
not install telnetd.  On the linux machine, I can do telnet localhost 25 
and get into mail but I can not do telnet external_ip 25 gives me a 
connection refused as well as from the Windows machines.

   Those of you who are regulars on this list know I am a newbie but I have 
looked everywhere I can think of and even purchased "Postfix, the 
definitive guide" with no luck.

   This is the killer for me, I even did "service iptables stop" and it 
still did not work with the firewall turned off.  I am not sure where to 
look now.  At my work machine as was suggested by someone here on this 
list, I installed shorewall and I was going to do that here at home but 
since iptables stop didnt help, I dont think shorewall would help either.

  My configuration by the way is that the linux box is behind a Linksys 
router so the machine has a 192.168.1.30 address and is on my network.  I 
have tried removing the Linksys and putting the Linux box directly on the 
net and on the linksys with the Linux IP in the DMZ and also just 
forwarding the ports...all 3 configurations gave the same result, port 25 
closed.

	mike

~~~~~ I'd rather be sailing and  ~~~ .oooO  Oooo.  ~~~~~~~~~~~
Mike Rambour                                   (    )  (     )    
Bug Writer er...Programmer                \   )   (   / 
      mikey at b2systems.com                  \_)  (_/  
**********************************************************************
If you want to learn more about the ULTIMATE BRITISH sports car,
then take a look at   http://www.singercars.com/
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~