Configure the send mail server for your local LAN. As well as the mail of user john should get by the jane user.

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Explanation

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1. iptables -t filter -A INPUT -s 192.168.0.0/24 -p tcp --dport 22 -j DROP iptables is the build-in firewall tools, used to filter the packets and for nat. By identifying Source Address, Destination Address, type of protocol, source and destination port we can filter the packets. -s ->Source Address -d -> Destination Address -p ->Layer 3 Protocol -d -> Destination Address --sport Source Prot --dport Destination Port -i -> Incoming Interface -o -> Outgoing Interface -t -> Table either filter or nat or mangle -A -> Chain can be either INPUT, OUTPUT, FORWARD, PREROUTING, POSTROUTING. ssh service use the 22 port so we can block connection from outside the LAN.

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