Wireguard itself can help you out with the task of forwarding traffic or creating an overlay network. There's also ngrok and tailscale for forwarding traffic an

Wireguard itself can help you out with the task of forwarding traffic or creating an overlay network. There's also ngrok and tailscale for forwarding traffic and doing NAT traversal. Except for wireguard, these are commercial platforms, the open source alternatives I know of, are (respectively): - https://bore.pub https://bore.pub && https://sslip.io https://sslip.io - https://github.com/juanfont/headscale https://github.com/juanfont/headscale I don't think there's anyone using this kind of tools for emails, the technical limitations elude my understanding TBH. This comment might be border to off-topic, but I think the tools fill in the niche use-case you just mentioned. Have fun! edit: might be of your interest to check this list! https://github.com/anderspitman/awesome-tunneling#recommendations https://github.com/anderspitman/awesome-tunneling#recommenda...