Hey guys.
just i like to say something
maybe it will explain something
The most companies who have a web server and like to get mails will use mal server.
And in this case, it will use 2 IP's
the first for the Web server and the second for the exchange server who is the mail server.
So, if u know the domain name and the IP that dosnt means that you can get mails .
This is a way to maybe get some mails

http:\\ip-address\exchange\user-name
or
http:\\ip-address\public*
*u must have outlook installed to view this mails