Hidayatul Soleh wrote on 09/12/12 00:52 +07:00:
> Btw mo tanya sedikit, bagaimana cara anda mengeceknya sehingga 
> mendapatkan IP 203.126.12.13

$ host -t mx portnet.com
portnet.com mail is handled by 10 portnethub.portnet.com.

$ host portnethub.portnet.com
portnethub.portnet.com has address 203.126.12.13

$ host 203.126.12.13 4.2.2.1
Using domain server:
Name: 4.2.2.1
Address: 4.2.2.1#53
Aliases:

13.12.126.203.in-addr.arpa domain name pointer psa2mail3.psa.com.sg.

$ telnet portnethub.portnet.com 25
Trying 203.126.12.13...
Connected to portnethub.portnet.com.
Escape character is '^]'.
220 Psa2mail3.psa.com.sg ESMTP


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syafril
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Syafril Hermansyah
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