(#wp6qgva) @email@example.com @firstname.lastname@example.org It wouldn’t be so useful for e-mail, but Tor hidden services (.onion services) punch through NAT and don’t require any open ports to run. You don’t need anything to run a Tor hidden service except for a machine to run it on. The only downsides are speed, ping, and the relative difficulty for others to use the service.
No matter what, if you’re going to self-host on your home network, take proper security precautions. Look into isolating the server on a VLAN so it can’t talk to the other devices on your local network, minimize bloat, enable a firewall, and keep your software updated to start.