[dns-operations] about list's MX

[RL Vaughn]

Dig this:
## dig dns-oarc.net MX

; <<>> DiG 9.8.3-P1 <<>> dns-oarc.net MX
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 57215
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;dns-oarc.net.			IN	MX

;; ANSWER SECTION:
dns-oarc.net.		30	IN	MX	0 mail.dns-oarc.net.


## dig  openstack.org MX

; <<>> DiG 9.8.3-P1 <<>> openstack.org MX
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 1614
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;openstack.org.			IN	MX

;; ANSWER SECTION:
openstack.org.		3600	IN	MX	10 mx1.emailsrvr.com.
openstack.org.		3600	IN	MX	20 mx2.emailsrvr.com.


Not this:

On 5/25/14, 8:25 PM, hua peng wrote:
> Hi,
> 
> I think I am totally confused. The lists I subscribed to seem have no MX
> records? For example,
> 
> $ dig lists.openstack.org mx
> # got nothing
> 
> $ dig lists.dns-oarc.net mx
> # got a CNAME
> 
> If no MX provided, how will the messages be routed?
> 
> Thanks.
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