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 From:  Ugo Bellavance <ugob at camo dash route dot com>
 To:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: Mail filtering gateway in DMZ config problem
 Date:  Mon, 18 Apr 2005 15:05:45 -0400
Chris Buechler wrote:
> On 4/18/05, Ugo Bellavance <ugob at camo dash route dot com> wrote:
> 
>>My internal mail server sends a message to the filtering gateway, which
>>processes it.  Then the filtering gatway tries to send the message to
>>the destination mail server (say 24.24.24.24), it gets redirected to my
>>internal mail server in an infinite loop.

> 
> I doubt if this is a firewall issue.  To verify that, run 'telnet
> s0.m0n0.ch 25' on your gateway.  If you don't get an answer, there's a
> network problem.  It's a sendmail configuration problem if the port
> does answer with something like the following.
> 
> Trying 80.238.135.125...
> Connected to s0.m0n0.ch.
> Escape character is '^]'.

This is why I think it is a firewall issue:

[ugob@mail ugob]$ telnet 80.238.135.125 25
Trying 80.238.135.125...
Connected to 80.238.135.125.
Escape character is '^]'.
220 my.internal.com ESMTP MAIL Service, Version: 5.0.2195.6713 ready at 
  Mon, 18 Apr 2005 15:04:06 -0400

> 
> -Chris