Linux Mail Server Administration: Part 1 Base OS

Mail Server Setup Complete guide on Github
https://github.com/PracticalSeminar360/Mail-Server-Setup

VirtualBox Download Link: https://download.virtualbox.org/virtualbox/6.1.14/VirtualBox-6.1.14-140239-Win.exe

Centos 7 64 Bit ISO Download Link:
http://mirror.rise.ph/centos/7.8.2003/isos/x86_64/CentOS-7-x86_64-Minimal-2003.iso

PfSense 64 Bit Download Link:
https://sgpfiles.pfsense.org/mirror/downloads/pfSense-CE-2.4.5-RELEASE-p1-amd64.iso.gz

source

centos 7