DNS MX subdomain delegation

Mathias Koerber mathias at koerber.org
Sat Jan 27 03:57:33 UTC 2001


On 26 Jan 2001 10:22:41 -0800, denisdavid72 at my-deja.com wrote:

>Ooops, I made a mistake in my error description because of some changes
>in my configuration: I want the mail to be sent to user at mail.dqs.de, so
>the MX and A records should be right in my view.

In that case they look like it. Lat's see:

	# dig mail.dqs.de mx

	; <<>> DiG 8.2 <<>> mail.dqs.de mx 
	;; res options: init recurs defnam dnsrch
	;; got answer:
	;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 4
	;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 3, 
		ADDITIONAL: 4
	;; QUERY SECTION:
	;;      mail.dqs.de, type = MX, class = IN

	;; ANSWER SECTION:
	mail.dqs.de.            1d16h52m54s IN MX  10 helpdesk.dqs.de.

	;; AUTHORITY SECTION:
	dqs.de.                 23h52m53s IN NS  pns.dqs.de.
	dqs.de.                 23h52m53s IN NS  pns.dtag.de.
	dqs.de.                 23h52m53s IN NS  		
		techfac.techfak.uni-bielefeld.de.

	;; ADDITIONAL SECTION:
	helpdesk.dqs.de.        1d16h52m54s IN A  212.185.196.12
	pns.dqs.de.             23h52m53s IN A  212.185.196.10
	pns.dtag.de.            1h55m4s IN A    194.25.0.125
	techfac.techfak.uni-bielefeld.de.  1h55m4s IN A  
		129.70.132.100

	;; Total query time: 111 msec
	;; FROM: matjes to SERVER: default -- 0.0.0.0
	;; WHEN: Sat Jan 27 10:13:31 2001
	;; MSG SIZE  sent: 29  rcvd: 209


So I sent a a testmail to flkwjfdwlkfjdh at mail.dqs.de (expecting a
'user unknown' in case it works as expected, or some other error
else):

Jan 27 11:41:55 matjes sendmail[22960]: f0R2JpC22701:
to=flkwjfdwlkfjdh at mail.dqs.de, ctladdr=mathias (501/100),
delay=01:22:04, xdelay=00:00:16, mailer=esmtp, pri=1290020,
relay=helpdesk.dqs.de. [212.185.196.12], dsn=4.0.0, stat=Deferred:
Connection reset by helpdesk.dqs.de.

Seems it goes to the correct host, but that the host does not want to
handle the mail. Have a look at your mailer configuration. This could
be a misconfigured anti-spam filter maybe

regards








>
>Denis
>
>In article <94pi1i$qqv at pub3.rc.vix.com>,
>  Denis.David at dqs.de wrote:
>> Hi,
>>
>> I have configured a DNS BIND server for our domain dqs.de.
>>
>> In out LAN we are running an EXCHANGE Mail server and a separate
>> helpdesk mail server (based on linux). Both run on the same IP subnet
>> in our LAN.
>>
>> I want the helpdesk staff to be mailed under user at helpdesk.dqs.de
>> (directed to the linux mailbox) and all others under user at dqs.de
>> (directed to the exchange mailbox), so I set up two separate MX
>records
>> in the zone file:
>>
>> dqs.de.           IN MX 10 exchange
>> mail.dqs.de.      IN MX 10 linux
>>
>> exchange.dqs.de.  IN A xxx.xxx.xxx.xxx
>> linux.dqs.de.     IN A xxx.xxx.xxx.xxx
>>
>> Unfortunately both mails user at helpdesk.dqs.de and user at dqs.de get
>> directed to the mail server, i.e. the ip of exchange is resolved as
>> mail exchanger. I even swapped the order of the two MX entries - no
>> success.
>>
>> Does anyone have an idea what went wrong ?
>>
>> Thanx for any help.
>>
>> Denis.
>>
>> Sent via Deja.com
>> http://www.deja.com/
>>
>>
>
>
>Sent via Deja.com
>http://www.deja.com/
>
>




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