[6148] in North American Network Operators' Group
Re: Compu$erve RFC 1123 5.3.3 violation
daemon@ATHENA.MIT.EDU (Alan Barrett)
Sun Nov 17 05:00:51 1996
Date: Sun, 17 Nov 1996 11:56:17 +0200 (GMT+0200)
From: Alan Barrett <apb@iafrica.com>
To: nanog@merit.edu
In-Reply-To: <199611162325.PAA23966@wisdom.home.vix.com>
Paul A Vixie <paul@vix.com> said:
> This:
[deleted]
> ...is NOT a variance from RFC1123 or any other specification.
That's true (as far as it goes), and I certainly don't see that bouncing
mail with a "mailbox is full" error is a violation of RFC1123 section
5.3.3.
But the following piece of evidence was not mentioned before:
compuserve.com. MX 10 mailgate.compuserve.com.
That MX, in conjunction with the CNAME (which was mentioned before):
mailgate.compuserve.com. CNAME mx3.compuserve.com.
adds up to a violation of RFC 1034 section 3.6.2:
"Domain names in RRs which point at another name should always
point at the primary name and not the alias."
(which esentially means "If a name appears on the left hand side of a
CNAME record then that name should not also appear on the right hand side
of any other record").
> It is
> completely appropriate for a mail domain to be a CNAME pointing at a
> handful of A's. It's not ok to _advertise_ one of these, as for example
> in an exported "From:" header,
I am not sure that my reading of RFC 1123 section 5.2.2 awould support
you there. But anyway, the "compuserve.com" domain *does* get advertised
in "From:" headers, so there is clearly a problem.
--apb (Alan Barrett)
