On Friday, 30 November 2001, Greg A. Woods wrote:
[snip]
> From the "normal" point of view any private address is indeed invalid.
> Your current workstation is not "normal" w.r.t. what an average mailer
> on the public Internet will see. No "normal" public mailer should ever
> see any unroutable address anywhere. If it is possible for it to detect
> and avoid such addresses in the "MAIL FROM:" parameter then it can be
> sure it won't get stuck with an unroutable bounce.

OK, you are right. Although, theoretically, there is no such thing as
an unroutable IP address. ;-) But I know what you mean.

> I.e. you should adjust your mailer's configuration to adapt to your
> special local configuration, but the default configuration should "fail
> safely" so that the majority of users don't have to adjust their
> configurations for the "normal" case. After there may still be one or
> more unroutable private networks even from your mailer's point of view.
> You might even want to be selective about which clients are allowed to
> use unroutable addresses in envelope parameters (or even headers) so
> that you can allow your workstation to send e-mail while at the same
> time preventing someone on the public Internet from using bogus
> addresses.

Point taken. And besides, machines with private addresses usually do
have hostnames, so it's only a matter of configuring external DNS
to point their MX to some publicly visible mailserver.

PS. Sorry for such late reply, this mail got lost between tons
of others somehow. :-}
 

-- 
"The Universe doesn't give you any points for doing things that are easy."
        -- Sheridan to Garibaldi in Babylon 5:"The Geometry of Shadows"
Dominik 'Rathann' Mierzejewski <rathann(at)we.are.one.pl>
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