cname replace in mail address? [off-topic] (Re: Attn Ronald Klop)

[Ronald Klop]

Mandatory? I'm googling, but can't find a document that declares it  
mandatory and only sendmail seems to do it.
I think it is lame to use DNS info to rewrite e-mail addresses, but the  
person who made it 'mandatory' will have good reasons for it.

Does somebody have a pointer to the specs about this?

Ronald.

On Fri, 27 Aug 2010 10:21:27 +0200, Mark Andrews <marka at isc.org> wrote:

>
> In message <op.vh27cqoy8527sy at 212-123-145-58.ip.telfort.nl>, "Ronald  
> Klop" writ
> es:
>> offtopic, but why do some mailers replace a CNAME in a mail-address?
>
> Because it used to be manditory to do so.  If you don't want it to
> be done use a MX record.
>
> 	klop.yi.org MX 0 thuis.klop.ws
>
> If you need klop.yi.org to have a address record then give it one.
>
> 	klop.yi.org A 212.123.145.58
>
> Mark
>
>> root at 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 =
>> =20
>> it.
>>
>> Ronald.
>>
>> On Tue, 24 Aug 2010 22:05:46 +0200, Andriy Gapon <avg at 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-DAEMON at citadel.icyb.net.ua>
>> > To: <avg at icyb.net.ua>
>> >
>> > The original message was received at Tue, 24 Aug 2010 23:03:27 +0300  
>> =20
>> > (EEST)
>> > from porto-e.starpoint.kiev.ua [212.40.38.100]
>> >
>> >    ----- The following addresses had permanent fatal errors -----
>> > <ronald-freebsd8 at thuis.klop.ws>
>> >
>> >    ----- Transcript of session follows -----
>> > ... while talking to thuis.klop.ws.:
>> >>>> RCPT To:<ronald-freebsd8 at thuis.klop.ws>
>> > <<< 554 5.7.1 <ronald-freebsd8 at thuis.klop.ws>: Relay access denied
>> > 554 <ronald-freebsd8 at thuis.klop.ws>... Service unavailable
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