Hi,
  I create One virtual domain and all the email is hosting in Optusnet.
  I just host their WEB Site but i can't send any email to this Domain.
Just Dig for you info
[root@ausnetitgw root]# dig tanknology.com.au MX
; <<>> DiG 9.2.1 <<>> tanknology.com.au MX
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2055
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;tanknology.com.au.             IN      MX
;; ANSWER SECTION:
tanknology.com.au.      86400   IN      MX      50 mail.optusnet.com.au.
;; Query time: 2070 msec
;; SERVER: 192.168.96.11#53(192.168.96.11)
;; WHEN: Fri Jul  8 09:52:13 2005
;; MSG SIZE  rcvd: 65
Please help