From: Alex van den Bogaerdt (alexergens.op.het.net)
Date: Sat Jan 03 2004 - 00:44:48 CST

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On Fri, Jan 02, 2004 at 04:00:01PM +0100, Tony Earnshaw wrote:

> > Run an extra instance of the smtpd program, one that can be
> > accessed from the internal network only. This is the only
> > smtpd accepting messages from your local users. It is then
> > easy to accept "mail from" known domains and discard the rest.
> >
> > The other smtpd only listens to external connections. Mynetworks
> > need not include the internal networks in that case.
>
> How would this help in weeding out users who send mail saying that it
> comes from someone else than themselves? E.g., mail forgers, spammers
> and pranksters. Which is what OP wants.

In the original post:

>If a mail from yahoo/hotmail to any domain in the relaydomains file,then
>it should go through.
                                                                                
>But if a mail comes from an IP specified in mynetworks but the from id
>is forged to be yahoo or hotmail then it should be denied.

I read this as:

My users (mynetworks) are forging yahoo.com/hotmail.com messages.

My answer:

Run a smtpd instance for local users (mynetworks) that allows
local domains only.

The original smtpd does not consider local users to be special
thus they cannot relay through it.

Clear?

Alex
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