On Tue, 4 May 2004 00:13:24 +0200
"Julian Mehnle" <[EMAIL PROTECTED]> wrote:
> Phillip Hutchings wrote:
> > The way the internet works is defined by the RFCs. Imagine if for some
> > reason a car manufacturer decided to have the registration/licence
> > plate on the roof of the car, not on the back. Sure, it's still there,
> > but it's not where it's supposed to be, and instead of arresting you
> > the police mounted mirrors on their cars long enough to get a
> > reflection of the plate.
>
> That's exactly what I meant. *Mounting* the license plate on the roof is
> bad, but *looking* for the license plate on the roof isn't -- if it's not
> significantly more effort.
>
> > So why should a mail server work around something that has been
> > specifically forbidden by the standard?
>
> Because obviously a significant number of people misinterprets the RFC.
More likely, they just have no clue and never read this RFC.
>
> > The RFC specifies that 'An MX record may only contain a pointer to a
> > valid A record'. And that's what it must contain.
>
> I agree, but then, there's that old saying "be strict in what you send,
> and liberal in what you accept". What harm is being done by looking for
> license plates on the roofs?
That doesn't mean you have to accept anything dumb people do. Dumb users
is something you need to cope with, dumb admins is something else.
Quote from Exim's manual:
It appears that more and more DNS zones are breaking the rules and
putting IP addresses on the right hand side of MX records. Exim follows
the rules and rejects this, giving an error message that explains the
mis-configuration. However, some other MTAs support this practice, so
to avoid `Why can't Exim do this?' complaints, "allow_mx_to_ip" exists,
in order to enable this heinous activity. It is not recommended, except
when you have no other choice.
Bye
Racke
--
LinuXia Systems => http://www.linuxia.de/
Expert Interchange Consulting and System Administration
ICDEVGROUP => http://www.icdevgroup.org/
Interchange Development Team
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