> Host march.com adalah web server bukan mail server, jadi yang open adalah tcp 
> port 80 (http) dan (mungkin) tcp port 443 (https).

> $ host -t a marsh.com
> marsh.com has address 54.208.44.25

> $ host -t a www.marsh.com
> www.marsh.com has address 34.248.101.155 www.marsh.com has address 
> 54.72.182.178

> Mail server namanya MX (Mail eXchanger) host.
> Jadi periksa dulu apa nama MX hostnya, setelah itu check port terhadap MX 
> host.

> https://www.dnsqueries.com/en/mx-lookup.php
> Salah satu cirinya MX hostnya hanya open smtp port (tcp port 25).

> silakan periksa ke MX host berikut

> $ host -t mx marsh.com
> marsh.com mail is handled by 10 mx13.marsh.com.
> marsh.com mail is handled by 10 mx12.marsh.com.
> marsh.com mail is handled by 10 mx11.marsh.com.
> marsh.com mail is handled by 10 mx10.marsh.com.
> marsh.com mail is handled by 10 mx09.marsh.com.
> marsh.com mail is handled by 10 mx08.marsh.com.
> marsh.com mail is handled by 10 mx53.marsh.com.
> marsh.com mail is handled by 10 mx52.marsh.com.
> marsh.com mail is handled by 10 mx51.marsh.com.
> marsh.com mail is handled by 10 mx50.marsh.com.

Paham pak.
Terima kasih atas ilmunya.


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