Nope
The MX record should point to your mailserver, and it should also show the A record. Here is my internal DNS lookup
Code:
[zimbra@office ~]$ dig xxxxxxx.net mx
; <<>> DiG 9.3.4-P1 <<>> xxxxxxxx.net mx
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43395
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 6
;; QUESTION SECTION:
;xxxxxxxx.net. IN MX
;; ANSWER SECTION:
xxxxxx.net. 600 IN MX 10 office.xxxxxx.net.
xxxxxx.net. 600 IN MX 20 mx2.mailhop.org.
;; AUTHORITY SECTION:
xxxxxxxx.net. 600 IN NS ns1.xxxxxxxx.net.
;; ADDITIONAL SECTION:
office.xxxxxxx.net. 600 IN A 192.168.1.100
ns1.xxxxxxxx.net. 600 IN A 192.168.1.100
;; Query time: 24 msec
;; SERVER: 192.168.1.100#53(192.168.1.100)
;; WHEN: Thu Jan 29 13:11:32 2009
;; MSG SIZE rcvd: 279