Re: [OFF-TOPIC] Re: Evil TCPD? (Was: Re: UseNet Gateway One Way ok?)
Systemkennung Linux (linux@mailhost.uni-koblenz.de)
Tue, 27 May 1997 22:42:54 +0200 (MET DST)
> > > - Block the connection all together (silently drop the syn)
> > > (ICMP dest unreachable)
> >
> > Can't you do that with ipfwadm -I -a (deny|reject)?
>
> If you have any lower priority MXes run by your ISP, the mail will simply
> route around your firewall.
Even worse; in practice almost all UNIX machines will happily relay email.
Ralf