[dns-operations] Curious use of cname

[Yonghua Peng]

>     mail.china.com. IN MX 10 mx-mail-china-com.icoremail.net.


Even if they have setup this, but the DNS clients never have the chance
to get the correct MX but always get a CNAME answer. Am I right?

$ dig mail.china.com mx @ns-bgp.china.com

; <<>> DiG 9.8.1-P1 <<>> mail.china.com mx @ns-bgp.china.com
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23565
;; flags: qr aa rd; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;mail.china.com.                        IN      MX

;; ANSWER SECTION:
mail.china.com.         500     IN      CNAME   mail.china.com.cachecn.com.

;; Query time: 75 msec
;; SERVER: 124.248.35.12#53(124.248.35.12)
;; WHEN: Mon Aug 11 09:24:44 2014
;; MSG SIZE  rcvd: 69


As you see, I queried for MX but got a CNAME. Thanks.