SECURITY.md

Security

OpenVibe.Mail handles addresses, mail metadata and — for a few seconds, in memory — a verification code. It does
not store message bodies. Treat a report about any of the following as security-sensitive.

Reporting

Report a vulnerability to [email protected]. Do not open a public issue for a suspected vulnerability.
Include the affected route, a minimal reproduction and what an attacker gains. We will acknowledge and keep you
informed; do not test against production mailboxes that are not yours.

What M1 runs

• Stalwart Community receives SMTP on port 25. There is no submission listener (587/465), no POP3, no Sieve and no
  public HTTPS listener; JMAP/management (8080) and IMAP (143) bind loopback only.
• Every domain is created with allowRelaying = false; an unauthenticated connection cannot relay.
• The API is behind OpenVibe.Network tokens. A typed token (typ or purpose) is refused. Another person's mask,
  burner or inbox answers 404, not 403.
• A burner made without an account is limited per IP and capped, and its mail is deleted when it expires.
• Stalwart runs in its own systemd slice with MemoryMax=1G, CPUQuota=100%, NoNewPrivileges=true and
  ProtectSystem=strict; the Node service is read-only too.
• Secrets live in /etc/openvibe/*.env (root, 0600). The rendered Stalwart config.json names the database
  password by environment variable; the S3 keys are read from the environment by apply.js and are never written
  to a rendered file or a log.

Out of scope for M1

Inbox AI is opt-in, uses OpenVibe.AI's private tier with the owner's allowance, and stores generated summaries and
drafts. Replies require an explicit send action and follow the existing outbound relay gate. DKIM signing and paid
custom domains remain later phases. A report that a receive-only domain has no SPF sending path is not a
vulnerability; v=spf1 -all is deliberate.

Secrets in the repository

There are none. .env.example names variables without values. CI uses throwaway service containers. If a secret
is ever committed, rotate it first, then remove it from history; deleting the file is not enough.