Hi,
I have some connections in my server which I think that they are spammers. So here I want to make my server more secure by blocking the port 25 while sending data on the network. But the users which are on the sbs machine must not get affected. So what is the way by which the data only goes to those whom I allow via port 25. The blocking things must avoid my known users and block the unrecognized users. So here I need a way to do this. Simply I want to stop the port and don't want my information to reach anyone. Help needed. Thanks in advance.
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