how to configure smtp server in linux

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Configure iptables firewall on the VPS server

Step 1: first confirm that your system has installed Iptables. Open the SSH terminal and enterWhereis iptablesIf you can see the following similar information, you have installed iptablesIptables:/sbin/iptables/usr/share/man/man8/iptables.8.gzIf this is not the prompt, or there is no prompt, you may not have installed iptables on Debian.Run the following command to install the SDK:Sudo apt-get install iptablesNote: all the commands in this document are completed under a general account. This gen

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