"MX->CNAME considered harmful" considered harmful.

From: Meng Weng Wong (no email)
Date: Thu Nov 01 2001 - 00:01:54 EST


On Wed, Oct 31, 2001 at 08:32:19PM +0000, Hamish Marson wrote:
|
| FWIW The Cricket book recommends using only canonical names in MX
| records, never aliases... But either will (usually) work.
|

This is an assertion which I have never seen properly justified.

While I personally don't do MX->CNAME simply because it
seems to be so extremely unfashionable as to invite negative
karma, as an academic exercise I would like to invite
discussion on whether, with modern DNS, it really should
continue to be an Internet bugbear.

In brief, MX->CNAME is frowned upon because it can cause
problems under a certain set of circumstances; but when
those circumstances are easily avoided, does there remain a
reason to deprecate it?

http://www.mengwong.com/misc/rfc1912-is-wrong.html

If an unassailable rebuttal is found I will be happy to
recant my argument and lay the question to rest for good.
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