I went to your video description ( https://www.youtube.com/watch?v=du_kHDluWNo ) and saw that these videos has been removed or relocated because the link not working anymore!
How to Install and configure PowerMTA On Linux Centos + Free Download https://youtu.be/8dGGZK3slqU
Install and Configure PowerMTA on Windows VPS server https://youtu.be/06KngzrRld4
Setup SMTP Rotation Without PMTA + GET Free Software https://youtu.be/QTugbWsKu6w
Kindly send me a link to them if you can.