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Add journal and allow/deny list design, quarantine candidate, roadmap entries, and Composer to Opus to Fable routing note. Co-authored-by: Cursor <cursoragent@cursor.com>
73 lines
2.8 KiB
Markdown
73 lines
2.8 KiB
Markdown
# Plan: inbound-quarantine
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**Status:** candidate — design TBD; needs explicit agreement before any code
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**Version:** TBD (`1.x` MINOR if opt-in and backward-compatible; may warrant `2.x`
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if it changes inbound storage or backup contract).
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---
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## Goal (draft)
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Let the operator **hold suspicious inbound mail** instead of only accept/reject
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at the milter — review in the panel, then release to the configured upstream,
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delete, or add sender to allow/deny lists.
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This is a **product boundary question**, not a settled design. The item exists
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so we can compare approaches before committing.
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## Why it is separate from inbound-antispam-panel
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[inbound-antispam-panel.md](inbound-antispam-panel.md) covers **metadata**
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(journal + lists). Quarantine implies **storing message bodies** (or a durable
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reference to them) under `/data`, retention, release workflow, and a wider
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attack/backup surface — closer to "mini-mailbox" than pure relay.
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## Open questions (to decide before a checklist)
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1. **Where mail lives**
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- SelfPost store under `/data/quarantine/` (panel owns lifecycle), or
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- delegate to rspamd/Redis and panel only proxies release (less storage in
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SelfPost, tighter rspamd coupling).
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2. **What "release" means**
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- inject into Postfix as a new delivery to the domain's upstream transport;
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- or manual download only (no automatic forward).
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3. **Retention and caps**
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- max age, max total bytes, per-domain limits; interaction with backup size.
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4. **RBAC**
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- global admin only vs domain-admin for assigned inbound domains.
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5. **Threat model**
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- malware in stored MIME, path traversal on extract, quota DoS on busy MX.
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6. **Product fit**
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- does this violate [product.md](../product.md) "no mailboxes" if we only
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hold spam suspects briefly? Explicit product decision required.
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## Context (as-built)
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- Inbound relay forwards or rejects; no local delivery ([inbound-relay.md](inbound-relay.md)).
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- Optional `INBOUND_ANTISPAM_MILTER` — external rspamd may quarantine on its
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own today, without panel integration.
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- DMARC `p=quarantine` is unrelated (outbound policy for receivers).
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## Likely out of scope (until revisited)
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- IMAP/webmail for quarantined mail.
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- End-user self-service quarantine (non-admin recipients).
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- Outbound quarantine.
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## Dependencies
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- [inbound-relay.md](inbound-relay.md) (shipped).
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- Sensible to decide **after** or **alongside**
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[inbound-antispam-panel.md](inbound-antispam-panel.md) (journal/lists), but
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not blocked on it for design discussion.
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## Done when (placeholder)
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TBD once approach is chosen. Minimum bar would include: opt-in flag, panel
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list/detail, release or discard action, retention, backup inclusion documented,
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security review.
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## Implementation checklist
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None yet — expand this plan after the open questions above are answered.
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