In this video I installed cyberpanel, a free, new, self-hosted open source web hosting control panel for the OpenLiteSpeed web server. With CyberPanel you can easily add new domains/vhosts and manage SSL for them.
Simple iinstall and an alternative to mailcow, mail-in-a-box, postfix, mailu, postfix, zimbra…

https://cyberpanel.net/docs/installing-cyberpanel/

After installation, make sure to open all ports listed.
If you are using a VPS service like Linode, Digital Ocean, make sure they open port 25, 465 and 587 as these are blocked by default unless you open a support ticket with them.
https://www.linode.com/docs/guides/running-a-mail-server/#spf-records

https://blog.cyberpanel.net/2018/05/15/achieve-10-10-email-score-with-cyberpanel/

https://www.linode.com/docs/platform/manager/dns-manager/#add-dns-records

https://www.linode.com/docs/networking/dns/configure-your-linode-for-reverse-dns/

Please note: I am by no means a professional at this, just read documents, videos, etc. and did this. If I can do it, that means anyone can!!!

Please take the opportunity to connect and share this video with your friends and family if you find it helpful.