I do, a bit differently from what’s been mentioned here so far:

I actually host my server at home, running mailcow as my email-server-software of choice, and incoming emails do get delivered directly to my ISP-assigned IP via dynamically updated DNS records.

However: Outgoing email is delivered via an SMTP relay service, specifically Mailgun (I like them because for normal everyday email volume it’s free), because even when I was hosting the email server in a datacenter, it was impossible to not encounter deliverability issues.

Also: Make sure that the user you ran “ssh-copy-id” against on the remote machine is also the user you’re trying to log in with.

+1 for bookstack

Currently one server as VM host for: -Nextcloud -Mailcow -Apache/PHP/mariadb as both reverse proxy for Nextcloud and the mailcow web interface and webserver for personal and company websites -Custom backup server (wireguard connections to different sites and incremental backup routines with bash/rsync)