Some messages should only arrive if you cannot send them yourself, and Aeterna is a self-hosted dead man's switch that makes sure they do. You write the messages, attach the files that matter, name the people who should receive them, and check in on a rhythm you choose. Keep checking in and nothing happens. Stop, and Aeterna delivers what you left behind. Each switch pairs your words with documents, photos, or instructions for specific recipients, and switches can address multiple recipients so one message can reach a partner, a sibling, and a lawyer at the same time. File attachments are stored encrypted and are automatically deleted from the server right after delivery, so sensitive material does not linger once it has done its job. Check-ins take seconds through the web interface or a quick link in your email, which keeps the heartbeat habit painless. When a switch fires it can also call webhooks, triggering home automation or custom scripts alongside the emails. Your SMTP settings live in the settings screen with live testing, and reverse proxy templates for Nginx, Traefik, and Caddy help you put the service behind your own domain with proper certificates. Running on a dedicated VPS on RepoCloud with guaranteed CPU, RAM, and SSD, full root SSH access, and a browser serial console. GPL-3.0 licensed.