offtopic, but why do some mailers replace a CNAME in a mail-address?

r...@sheeva2:/var/vmail# host klop.yi.org
klop.yi.org             CNAME   thuis.klop.ws
thuis.klop.ws           A       212.123.145.58

It is not the first time that I'm bitten by this, but I never understood it.

Ronald.

On Tue, 24 Aug 2010 22:05:46 +0200, Andriy Gapon <a...@icyb.net.ua> wrote:


Ronald,

your email address bounces, that's inconvenient.


-------- Original Message --------
Subject: Returned mail: Service unavailable
Date: Tue, 24 Aug 2010 23:03:33 +0300 (EEST)
From: Mail Delivery Subsystem <mailer-dae...@citadel.icyb.net.ua>
To: <a...@icyb.net.ua>

The original message was received at Tue, 24 Aug 2010 23:03:27 +0300 (EEST)
from porto-e.starpoint.kiev.ua [212.40.38.100]

   ----- The following addresses had permanent fatal errors -----
<ronald-freeb...@thuis.klop.ws>

   ----- Transcript of session follows -----
... while talking to thuis.klop.ws.:
RCPT To:<ronald-freeb...@thuis.klop.ws>
<<< 554 5.7.1 <ronald-freeb...@thuis.klop.ws>: Relay access denied
554 <ronald-freeb...@thuis.klop.ws>... Service unavailable
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