Transparent mail filter

[Serge Fonville]

Hi,
I am in the process of setting up a t ransparent
mail
filter<http://www.linuxquestions.org/questions/linux-server-73/transparent-mail-filter-distribution-714608/#post3488536>
 .

Postfix seems the best I could find for this.

I already have the following 'idea' about how it should be

NAT router 172.16.0.254
Existing MS Exchange Server 172.16.0.2

In between I intend to place a transparent host (through a bridged
interface) that redirects all traffic destined for 172.16.0.2 on port 25 to
a local postfix instance.
The postfix instance relays the mail to the exchange server after processed
by Spamassasin.
The source and destination domains are unkown.
This seems to mean a couple of things I think (after reading the docs)

mynetworks should be 0.0.0.0/0 (which seems really odd to me)
I am not sure what I need to set relaydomains to, since these are unkown...
relayhost should be 172.16.0.2

Any help is greatly appreciated

Thanks a lot.

Regards,

Serge Fonville

Re: Transparent mail filter

[Noel Jones]

Serge Fonville wrote:

Hi,

I am in the process of setting up a t ransparent 
mail filter 
<http://www.linuxquestions.org/questions/linux-server-73/transparent-mail-filter-distribution-714608/#post3488536> .


Postfix seems the best I could find for this.


Please don't post HTML to the list.

Postfix is not a transparent proxy and can not be made to 
behave like one.


Postfix can be used as an MX gateway in front of exchange, 
here's a general example:

http://www.postfix.org/STANDARD_CONFIGURATION_README.html#firewall

If you want a transparent proxy, you might look at ASSP.

  -- Noel Jones

Re: Transparent mail filter

[Serge Fonville]

> Please don't post HTML to the list.

Sorry about the HTML.

> Postfix is not a transparent proxy and can not be made to behave like one.
> Postfix can be used as an MX gateway in front of exchange, here's a general
> If you want a transparent proxy, you might look at ASSP.

Thanks for the answer, I will look into that then

Regards,

Serge Fonville

Re: Transparent mail filter

[Victor Duchovni]

On Mon, Mar 30, 2009 at 11:44:48PM +0200, Serge Fonville wrote:

> > Postfix is not a transparent proxy and can not be made to behave like one.
> > Postfix can be used as an MX gateway in front of exchange, here's a general
> > If you want a transparent proxy, you might look at ASSP.
> 
> Thanks for the answer, I will look into that then

Perhaps, but why do you believe you need a transparent proxy between the
Internet and your Exchange server? Generally, this is not a good idea...

You got the right answer to something that is likely the wrong question.
What problem are you *really* trying to solve?

-- 
Viktor.

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