Sealed mail between Obsidian vaults. Your notes already live on your devices — your mail should too. Interleaf turns any vault into a mail endpoint: Ed25519 identities, messages sealed to the recipient's key, relays that store opaque boxes they cannot open.
Verification is native. Every message carries a signature checked against a pinned key. Key changes are loud, not silent.
No accounts, no directory. First contact happens out-of-band through invite codes — the invite is the address. Strangers knock into a quarantine you review.
Relays can't read. The relay is a dumb per-fingerprint mailbox of sealed boxes. It sees ciphertext sizes and timings. That's all.