Meng Weng Wong wrote:
>
> I don't want to make things more complex. In practice I
> don't do MX->CNAME at all. What I am doing is playing
> scientist in search of The Truth; I submit that avoiding
> MX->CNAME is the postmaster's version of not stepping on
> cracks or walking under ladders.

No resource records should refer to CNAME's according to the
standards (Except CNAME records and even that is discouraged).

I'm not aware of many things breaking except where CNAME
chaining forces excessive lookups. So if you did do this you
might lose the ability to receive mail from hideously old
versions of sendmail, DJB has redone his survey recently, so you
can probably find out what proportion of mail severs would be
affected if you know in what version of sendmail the behaviour
changed.

CNAME's were never terribly well thought out bit of the DNS
standards anyway, I'd say just avoid them as much as it is
reasonable to do so (Most people never need them).
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