Re: DNS goofups galore...

From: Jan Gyselinck (
Date: Fri Feb 09 2001 - 02:04:54 EST

On Thu, Feb 08, 2001 at 02:58:30PM -0800, H. Peter Anvin wrote:
> Followup to: <>
> By author: Gerhard Mack <>
> In newsgroup:
> >
> > Thanklfully bind 9 barfs if you even try this sort of thing.
> >
> Personally I find it puzzling what's wrong with MX -> CNAME at all; it
> seems like a useful setup without the pitfalls that either NS -> CNAME
> or CNAME -> CNAME can cause (NS -> CNAME can trivially result in
> irreducible situations; CNAME -> CNAME would require a link maximum
> count which could result in obscure breakage.)
> -hpa

There's not really something wrong with MX's pointing to CNAME's. It's just that some mailservers could (can?) not handle this. So if you want to be able to receive mail from all kinds of mailservers, don't use CNAME's for MX's.


Jan Gyselinck
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