On Wed, 2003-11-05 at 15:53, Wakko Warner wrote:
> > > I have try to find description about exim n' "fake mailing" telnet host
> > > 25
> >
> > There is no such distinction between a "faked with telnet" and "real" mail
> > session. They're both just TCP connections. Your Exim daemon has no idea
> > whether the entity on the other end of the connection is someone with a
> > telnet client or an MTA.
>
> I've seen otherwise. Raptor firewall can detect the difference and has the
> option to disable usage of telnetting to port 25. IIRC, telnet doesn't use
> read/write to send data and has other tcp properties. I could be wrong, but
> I tried it myself and telnet was refused where as an mta connection wasn't.
> It didn't stop netcat though.
Sounds like options negotiation - telnet sends some semi-out-of-band
info to negotiation settings.
Nigel.
--
[ Nigel Metheringham Nigel.Metheringham@??? ]
[ - Comments in this message are my own and not ITO opinion/policy - ]
