Yup I have 2 boxes Linux RH7.2 on the net acting as gateway and the NotesSMTP inside. 
eth1 masqueraded. 

Bouncing of all mails for the notes was the main problem. 
--

On Fri, 16 Aug 2002 17:10:35  
 Mark M. Barrios wrote:
>check this out you can adapt it for smtp just change the ports :)
>
>http://www.tldp.org/HOWTO/mini/TransparentProxy-6.html
>
>what is your setup btw? do you have two boxes where only one is visible 
>on the internet?
>and the other is only NATed?
>
>or are they both visible?
>
>Jesus, Jr. C. Enerio wrote:
>
>>yes, I include FORWARD_IPV4=yes to /etc/sysconfig/network. I know it work same way, 
>is it?
>>
>>--
>>
>>On Fri, 16 Aug 2002 13:14:46  
>> Mark M. Barrios wrote:
>>  
>>
>>>is forwarding enabled?
>>>try
>>>echo 1 > /proc/sys/net/ipv4/ip_forward
>>>
>>>Jesus, Jr. C. Enerio wrote:
>>>
>>>    
>>>
>>>>Actually everything was working fine using the old TurboLinux 4.0 (2.2.12) which 
>has only one job, to masquerade eth1 136.0.0.0 and eth1:1 192.168.10.0 runnning no 
>single daemon(no MTA relay).
>>>>
>>>>The problem started when I switched it RH7.2 (2.4.9-34) using the same 
>configurations. Is it about Kernel 2.4? Does this kernel still support the 2.2 Kernel 
>way of multiple ip? 
>>>>ifconfig eth1:1 <ip> broadcast <broadcast> netmask <netmask>
>>>>route add -host <ip> dev eth1:1
>>>>
>>>>Its what I did. If not, how?
>>>>
>>>>Jess
>>>>--
>>>>
>>>>On Thu, 15 Aug 2002 19:43:11  
>>>>Mark M. Barrios wrote:
>>>> 
>>>>
>>>>      
>>>>
>>>>>hi,
>>>>>
>>>>>you can make your linux box an MX of your domain in which your final 
>>>>>destination is your lotusnotes server
>>>>>also make your lotusnotes send mail using your linux box as its default 
>>>>>relay.
>>>>>and SMTP is on tcp port 25
>>>>>
>>>>>what MTA are you using on your linux box anyway? is the lotusnotes box 
>>>>>visible from the outside (has a live ip)?
>>>>>
>>>>>Jesus, Jr. C. Enerio wrote:
>>>>>
>>>>>   
>>>>>
>>>>>        
>>>>>
>>>>>>Hi everyone,
>>>>>>
>>>>>>How do I enable my mailserver (Lotus Notes) to send and receive mails from my 
>linux firewall? I successfully enable it to allow to relay mails outside using 
>masquerading. I also flushed all rules from my firewall and clear all rules from my 
>TCP wrappers. But still all incoming mails bounces.  I heard Notes SMTP works on port 
>1352, is it? If so how do I do it on 2.4 kernel RH 7.2? Help is greatly appreciated.
>>>>>>
>>>>>>Jess
>>>>>>
>>>>>>
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