Currently there isn't a MX record setup for your domain:
Code:
7~$ dig ex.inet-soft.com.ph
; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.17.rc1.el6_4.6 <<>> ex.inet-soft.com.ph
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 40273
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;ex.inet-soft.com.ph. IN A
;; ANSWER SECTION:
ex.inet-soft.com.ph. 300 IN A 203.119.6.168
;; Query time: 302 msec
;; SERVER: 213.133.98.98#53(213.133.98.98)
;; WHEN: Sat Sep 7 14:10:55 2013
;; MSG SIZE rcvd: 53
My guess is you'd need to talk to your domain hoster to get one set up.
If you want to play your own DNS provider you'd need to talk to them as well. Some of them do and some don't do this kind of stuff.