This guide will help you how to set or install Plesk for the very first time and configure it so it will make you comfortable. I have added some steps so you can follow what to do next…

Install Plesk

https://docs.plesk.com/en-US/onyx/deployment-guide/plesk-installation-and-upgrade-on-single-server/1click-plesk-installation/installing-plesk-for-linux-in-one-click.76444/

screen -S <instance_name>

yum install screen – centos
apt install screen – ubuntu

screen -ls

Detach screen session

ctrl + a + d

Login session screen

screen -r 

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Install Plesk cli

sh <(curl https://autoinstall.plesk.com/one-click-installer || wget -O - https://autoinstall.plesk.com/one-click-installer)

Login plesk admin

plesk login

fill administrator correct email address based on whmcs

Tools Settings > Security Policy > Password Strenght > Strong

Tools Settings > Update & Upgrades > Add/Remove Components:
Fail2ban, Plesk Migrator, Mod Security, PHP 73, 72, 71, 56, Let’s Encrypt

Tools Settings > Mail Server Settings:

• increase Maximum message size
• increase Maximum number of connections for a user per IP address
• Enable SPF spam protection to check incoming mail
• SPF checking mode > Only create received SPF headers, never block
• Switch on spam protection based on DNS blackhole lists
• b.barracudacentral.org; zen.spamhaus.org; dnsbl.sorbs.net

Configure fail2ban

Tools & settings > Fail2ban > Settings > Enable Intrusion Detection
Increase Number of failures before the IP address is banned > 5

Set jails > Plesk postfix, Plesk proftpd, Plesk dovecot

And you are done.