A practical outbound-only SMTP relay on a VPS: IP reputation checks, TCP 25, PTR/rDNS, Postfix, OpenDKIM, DNS authentication, an HTTP relay, queueing, systemd, gateway auth, validation, and rollback.

A Raspberry Pi Xray setup for stopping local DNS leaks while sending game platforms through the proxy and game download CDNs direct.

A Raspberry Pi Wi-Fi hotspot setup with hostapd, dnsmasq, Xray transparent proxying, DNS pollution checks, nftables TProxy, and client-side validation.

A practical home access setup behind carrier NAT using NATMap, ddns-go, nginx, acme.sh, and Cloudflare Worker, with validation and rollback steps.

How cloudflared was moved from a direct home network exit to an Xray proxy exit, with nftables redirection, routeOnly sniffing, and Cloudflare edge routing checks.

A field note on using a Raspberry Pi as a side router with Tailscale exit routing, Xray transparent proxying, DNS handling, nftables rules, and rollback checks.