550 cannot route to sender

[Mark_Andrews at iengines.com]

	The machine that is gatewaying the mail onto the internet needs
	to have a valid reverse DNS entry.  While I don't necessarily 
	with this policy decision, I understand why it is being done.

	Mark

; <<>> DiG 8.2 <<>> -x 
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 6
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 2
;; QUERY SECTION:
;;	46.107.143.204.in-addr.arpa, type = ANY, class = IN

;; AUTHORITY SECTION:
107.143.204.in-addr.arpa.  2h57m54s IN SOA  ns1.slt.lk. postmaster.slt.lk. (
					95120502	; serial
					3H		; refresh
					1H		; retry
					5w6d16h		; expiry
					1D )		; minimum

107.143.204.in-addr.arpa.  1h57m34s IN NS  ns2.slt.lk.
107.143.204.in-addr.arpa.  1h57m34s IN NS  ns1.slt.lk.

;; ADDITIONAL SECTION:
ns2.slt.lk.		6d23h57m40s IN A  204.143.96.18
ns1.slt.lk.		6d23h57m40s IN A  204.143.96.17

;; Total query time: 1 msec
;; FROM: bsdi.dv.isc.org to SERVER: default -- 130.155.191.233
;; WHEN: Wed Nov 17 23:35:13 1999
;; MSG SIZE  sent: 45  rcvd: 190


> On Tue, Nov 16, 1999 at 09:48:23AM -0500, Joseph S D Yao wrote:
> 
> Hi Joseph,
> 
> You have helped me a few times earlier, thanks for that.
> I do not think I have explained myself well enough this time.
> 
> > > I have set up Qmail on "metta.lk" (204.143.107.46)
> > > and use autoturn to get my mail to "col7.metta.lk" (172.16.1.1)
> > > Everything works quite well.
> > > To some domains I get messages like the below returned by Mailer Daemon.
> > > Is this a DNS problem on my machine
> > > or is it because I am on local IPs
>  
> > Private internet addresses, such as col7's, should never be visible in
> > DNS to the general Internet.  It looks like the remote host found the
> > address for col7, and tried to send it directly. 
> 
> Sorry for the confusion, but it is me that is sending to a remote host.
> and my messages are getting returned.
> Please see below returned message.
> 
> ----------------------------------------------------------------
> 
> Delivered-To: bind at col7.metta.lk
> Date: 17 Nov 1999 01:54:37 -0000
> From: MAILER-DAEMON at metta.lk
> To: bind at col7.metta.lk
> Subject: failure notice
> 
> Hi. This is the qmail-send program at metta.lk.
> I'm afraid I wasn't able to deliver your message to the following
> addresses.
> This is a permanent error; I've given up. Sorry it didn't work out.
> 
> <Rainer.Klier at erl.sbs.de>:
> 
> Connected to 194.138.37.40 but sender was rejected.
> Remote host said: 501 <bind at col7.metta.lk>... Sender domain must exist
> 
> --- Below this line is a copy of the message.
> 
> Return-Path: <bind at col7.metta.lk>
> Received: (qmail 16316 invoked from network); 17 Nov 1999 01:52:25 -0000
> Received: from col7.metta.lk (HELO metta.lk) (root at 172.16.1.1)
>   by dhamma.metta.lk with SMTP; 17 Nov 1999 01:52:25 -0000
> Received: (qmail 5562 invoked by uid 523); 17 Nov 1999 01:14:13 -0000
> Date: Wed, 17 Nov 1999 07:14:13 +0600
> From: bind at col7.metta.lk
> To: Rainer Klier <Rainer.Klier at erl.sbs.de>
> Subject: Re: Docu ?
> Message-ID: <19991117071413.A5555 at col7.metta.lk>
> References: <383120C1.F9B5D238 at erl.sbs.de>
> Mime-Version: 1.0
> Content-Type: text/plain; charset=us-ascii
> X-Mailer: Mutt 0.95.4us
> In-Reply-To: <383120C1.F9B5D238 at erl.sbs.de>; from Rainer Klier on Tue, Nov
> 16,
> +1999 at 10:15:45AM +0100
> 
> On Tue, Nov 16, 1999 at 10:15:45AM +0100, Rainer Klier wrote:
> 
> Hi there ...
> 
> > is there a good documentation for bind 8? Is there a FAQ ?
> > Before I ask more stupid questions, I thought I4d better
> > ask first for a docu :) I downloaded bind-doc.tgz, but
> > it isn4t that detailed.
> 
> There is a very good and simple howto on most linux CDs
> on RH I think /usr/doc/HOWTO/DNSsomething-or the-other
> 
> If you do not find a copy, just drop me a line and I shall send it to you.
> 
> Jacob
> 
> 
--
Mark Andrews, Internet Engines Inc. / Internet Software Consortium
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at iengines.com