On Mon, 22 Jan 2001 at 21:58:13 -0500, [EMAIL PROTECTED] wrote:
> OK, here's the picture. I have a Debian box as the SMTP gateway for
> about 4000 active nodes on a class B network. Many of these machines
> run sendmail, misconfigured, of course. I have MX records for the inside
> machines in the DNS all pointing to the gateway, which is configured to
> deny 3rd party relay. But, since it just forwards to the real machine,
> the relays still happen. Is there any way to stop this at the gateway
> machine?
>
You can block at the border router all outgoing connections to SMTP port
(25) _besides_ these ones which originate from your "legal" SMTP gateway.
--
Tomasz Papszun SysAdm @ TP S.A. Lodz, Poland | And it's only
[EMAIL PROTECTED] http://www.lodz.tpsa.pl/ | ones and zeros.
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