@GrapheneOS@FamilyCyclist yeah most mail providers are unreasonable in my experience. I don’t host email because I didn’t want to do that to myself but I do some IP forwarding with netfilter (unfortunately it’s written with iptables instead of the hip nftables) and a wireguard tunnel. My home servers just use a wg tunnel and it’s neat. Works fine for what it does. I wanted to get into rewriting ips so my traffic wasn’t all just from my wireguard interface, I believe it’s possible with netfilter in particular I just never got around to it.