Ainsi parlait Ken Thompson :
> On Monday 11 August 2003 10:24 am, Guillaume Rousse wrote:
> > Ainsi parlait Ken Thompson :
> > > How are they getting my personal IP when I'm connecting through a
> > > firewall?
> >
> > Cause they are in the mail enveloppe headers.
> >
> > > Does Kmail send this info somehow and if so, how can it be turned off?
> >
> > It can't, it wouldn't be RFC compliant otherwise.
>
> This seem to go against what I thought was one of the reasons for having a
> firewall in the first place. I don't understand why email needs to send the
> specific machine IP address.
You're confusing. A firewall works essentially at transport level (IP),
whereas you're dealing here with application level (SMTP) problems. When you
want to masquerade your IP adresses on the web, the easiest way is to use an
HTTP proxy, not a firewall. The same goes for mail, the easiest way is to use
a SMTP gateway.
>
> > If you really care, install a SMTP server and perform headers rewriting.
>
> Can't, ISP limitations.
Your ISP can block external connections on port 25, but can't prevent you from
listening your own network.
--
Guillaume Rousse
In any human endeavor, once you've exhausted all possibilities and fail, there
will be one solution, simple and obvious, highly visible to everyone else
-- SNAFU Equations (JB's Scholastic Laws) n�5
