Attach a PDF, a photo (PNG, JPEG, GIF, BMP) or plain text. The subject line becomes the job’s title. Press send — the job waits at its own page, and the queue below shows it honestly as waiting.

The server holds the file and never claims the paper. Each job’s page is the receipt of arrival; the sheet coming out of the printer is the receipt of printing.

The runner is one small Python file, public and readable. It watches a queue, downloads a waiting job, and hands it to the computer’s own print system (CUPS) — which speaks IPP to nearly any modern printer. No vendor drives, no cloud, no account.

Download the runner (print-agent.py) — read it before you run it; that is the point.

When that computer has no print system, the runner holds the file on disk and says so out loud — a failed print is a visible failure, never a dropped promise. It marks what it has printed in its own ledger.

Each job lives at an unguessable page; the public queue shows titles and times, not contents. Identity-gated queues and a printed-receipt loop are on the road behind.