How To Setup Private email server with Public Domain

I use Tubebuddy To grow My channel its a great tool https://www.tubebuddy.com/nerdytechtips Don't forget to like our Facebook page   / nerdytechtips   Steps update ubuntu ----- sudo apt update ----sudo apt upgrade install SSH ------sudo apt install openssh-server ssh status -----sudo systemctl status ssh allow ssh port to open ----sudo ufw allow ssh the following to determine your DKIM keys: ---sudo amavisd-new showkeys