Determining where mail is handled is a great starting place to locate the target
organization’s firewall network. Often in a commercial environment, mail is handled on
the same system as the firewall, or at least on the same network. Therefore, we can use
the host command to help harvest even more information:
[bash]$ host example.com
example.com has address 192.168.1.7
example.com mail is handled (pri=10) by mail.example.com
example.com mail is handled (pri=20) by smtp-forward.example.com
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