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 <[email protected]> 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 <[email protected]>
To: <[email protected]>

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 -----
<[email protected]>

   ----- Transcript of session follows -----
... while talking to thuis.klop.ws.:
RCPT To:<[email protected]>
<<< 554 5.7.1 <[email protected]>: Relay access denied
554 <[email protected]>... Service unavailable
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