Matt The Horwood

I moved to Google workspace for email, yes I know it Google.

I have my home IP and dedi IP in the routing settings, then just use SMTP to Google and let them forward to me.

All servers have null mail installed and setup for Google, I also have docker containers with config if needed

You need a way to hand it a file for editing, nextcloud can do that

I use nginx as the internet facing proxy, write my own config and manage it with source control. Also use traefik in docker land with service labels to configure it

Im not sure I understand your issue, DNS is the magic that allows you to goto home.somedomain.com and get a webpage. But you still need to give DNS the location of the server, much like the contacts in your phone.

DDNS is how you have your home connection attached to a DNS record that is updated when the IP changes, see other comments.

Also once you understand how it all hangs together, you can do some really cool magic to make getting to your services easier