Gmail with my data on disk and my filter rules in git. No vendor lock on the routing logic, full-text search that doesn't depend on an internet round-trip, and a TUI for triage. Built as five small CLI tools wired together with a justfile.
This is the shape of the system, not the secrets. The Nix module that installs it is reproduced inline below; my account configs and OAuth credentials live in private stores. Friends can lift the structure into their own dotfiles in an afternoon.
Five tools, each doing one thing: