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Mogens Kjaer

2009-Mar-07 12:40 UTC

[CentOS] Mail delivery failing with 450

James Pifer wrote:
...> Anyone see any problems in my DNS records?
Doesn't look right to me:

$ nslookup
 > set type=mx
 > obrien-pifer.com
Server:         127.0.0.1
Address:        127.0.0.1#53

Non-authoritative answer:
*** Can't find obrien-pifer.com: No answer

Authoritative answers can be found from:
 >
$ nslookup
 > www.obrien-pifer.com
Server:         127.0.0.1
Address:        127.0.0.1#53

Non-authoritative answer:
www.obrien-pifer.com    canonical name = obrien-pifer.com.
Name:   obrien-pifer.com
Address: 70.62.90.185

Mogens

-- 
Mogens Kjaer, Carlsberg A/S, Computer Department
Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark
Phone: +45 33 27 53 25, Fax: +45 33 27 47 08
Email: mk at crc.dk Homepage: http://www.crc.dk

Louis Lagendijk

2009-Mar-07 12:55 UTC

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[CentOS] Mail delivery failing with 450

hi James
there is a MX recond for mail.obrien-pifer.com, not for
obrien-pifer.com:
bash-3.2$ dig obrien-pifer.com any

; <<>> DiG 9.5.1-P1-RedHat-9.5.1-1.P1.fc10 <<>>
obrien-pifer.com any
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 10894
;; flags: qr rd ra; QUERY: 1, ANSWER: 5, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;obrien-pifer.com.		IN	ANY

;; ANSWER SECTION:
obrien-pifer.com.	36647	IN	A	70.62.90.185
obrien-pifer.com.	36647	IN	NS	porky.obrien-pifer.com.
obrien-pifer.com.	36647	IN	NS	sammy.obrien-pifer.com.
obrien-pifer.com.	36647	IN	NS	ns1.obrien-pifer.com.
obrien-pifer.com.	36647	IN	NS	ns2.obrien-pifer.com.

;; AUTHORITY SECTION:
obrien-pifer.com.	36647	IN	NS	ns2.obrien-pifer.com.
obrien-pifer.com.	36647	IN	NS	porky.obrien-pifer.com.
obrien-pifer.com.	36647	IN	NS	sammy.obrien-pifer.com.
obrien-pifer.com.	36647	IN	NS	ns1.obrien-pifer.com.

;; ADDITIONAL SECTION:
ns1.obrien-pifer.com.	36647	IN	A	70.62.90.185
ns2.obrien-pifer.com.	36647	IN	A	70.62.90.185
porky.obrien-pifer.com.	36647	IN	A	70.62.90.185
sammy.obrien-pifer.com.	36647	IN	A	70.62.90.185

;; Query time: 3 msec
;; SERVER: 192.168.159.1#53(192.168.159.1)
;; WHEN: Sat Mar  7 13:53:39 2009
;; MSG SIZE  rcvd: 246

bash-3.2$ dig mail.obrien-pifer.com any

; <<>> DiG 9.5.1-P1-RedHat-9.5.1-1.P1.fc10 <<>>
mail.obrien-pifer.com
any
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 31815
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 4

;; QUESTION SECTION:
;mail.obrien-pifer.com.		IN	ANY

;; ANSWER SECTION:
mail.obrien-pifer.com.	38400	IN	MX	1 70.62.90.185.obrien-pifer.com.

;; AUTHORITY SECTION:
obrien-pifer.com.	36592	IN	NS	ns1.obrien-pifer.com.
obrien-pifer.com.	36592	IN	NS	ns2.obrien-pifer.com.
obrien-pifer.com.	36592	IN	NS	porky.obrien-pifer.com.
obrien-pifer.com.	36592	IN	NS	sammy.obrien-pifer.com.

;; ADDITIONAL SECTION:
ns1.obrien-pifer.com.	36592	IN	A	70.62.90.185
ns2.obrien-pifer.com.	36592	IN	A	70.62.90.185
porky.obrien-pifer.com.	36592	IN	A	70.62.90.185
sammy.obrien-pifer.com.	36592	IN	A	70.62.90.185

;; Query time: 140 msec
;; SERVER: 192.168.159.1#53(192.168.159.1)
;; WHEN: Sat Mar  7 13:54:34 2009
;; MSG SIZE  rcvd: 208

bash-3.2$ 

Br, Louis

On Sat, 2009-03-07 at 08:18 -0500, James Pifer wrote:> I'm not sure why this started, but apparently I'm having a DNS
problem.
> Yesterday mail started bouncing with this error:
> 450 Unable to find obrien-pifer.com
> 
> I think the messages eventually get delivered, but not sure. I guess
> I'll see if this one makes the list. 
> 
> I checked my domain using http://www.checkdns.net/ and it gives me a
> couple warnings. One is that there's no MX record, but there is. 
> 
> I use a smarthost for sending mail. 
> 
> My DNS records are: http://www.obrien-pifer.com/mydns.txt
> 
> Anyone see any problems in my DNS records?
> 
> Thanks,
> James
> 
> 
> 
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos

Joebstl Thomas

2009-Mar-07 13:01 UTC

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[CentOS] Mail delivery failing with 450

Hi James,

MX-records must point to A-records and not to IP adresses.
A "dig -t AXFR obrien-pifer.com @ns1.obrien-pifer.com | grep MX"
returns:
mail.obrien-pifer.com.  38400   IN      MX      1 
70.62.90.185.obrien-pifer.com.

Whereas you list "mail.obrien-pifer.com.    IN    MX    1
70.62.90.185"
in your config.

So your setup is invalid because:
- you're pointing your one and only MX record directly to an IP
- since it is interpreted as host and missing a "." at the end
it's
expanded to "70.62.90.185.obrien-pifer.com." which doesnt exist
- it's a MX record for mail.obrien-pifer.com and not obrien-pifer.com

Your whole definition of the MX record looks goofy to me, dont want to 
sound like an a.. but you better (re)read some tutorials on setting up DNS.
I really wonder if you receive the reply at all.

Regards,
Thomas

James Pifer

2009-Mar-07 13:18 UTC

head link

[CentOS] Mail delivery failing with 450

I'm not sure why this started, but apparently I'm having a DNS problem.
Yesterday mail started bouncing with this error:
450 Unable to find obrien-pifer.com

I think the messages eventually get delivered, but not sure. I guess
I'll see if this one makes the list. 

I checked my domain using http://www.checkdns.net/ and it gives me a
couple warnings. One is that there's no MX record, but there is. 

I use a smarthost for sending mail. 

My DNS records are: http://www.obrien-pifer.com/mydns.txt

Anyone see any problems in my DNS records?

Thanks,
James

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