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

[Peter C. Lai]

Does the recipient MTA actually receive for both klop.yi.org *and*
thuis.klop.ws? The recipient MTA will dereference the CNAME and rewrite the
envelope for the reason that it can only relay to an RR that points to a 
real host.

You might be able to fix it if you configure the mta on thuis.klop.ws to 
accept mail for the thuis.klop.ws domain in addition to klop.yi.org (which I 
assume is how you have it setup).

In a situation like this if you have domain CNAME originaldomain then
you better make sure that someone can send to either 
@domain AND @originaldomain otherwise it doesn't make sense.

On 2010-08-27 10:03:52AM +0200, Ronald Klop wrote:
> offtopic, but why do some mailers replace a CNAME in a mail-address?
> 
> 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  
> 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  
> > (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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-- 
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Peter C. Lai                 | Bard College at Simon's Rock
Systems Administrator        | 84 Alford Rd.
Information Technology Svcs. | Gt. Barrington, MA 01230 USA
peter AT simons-rock.edu     | (413) 528-7428
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