mixandClaude Opus 5.5
977d63a2ea
The owner, 2026-10-12: take quarantine out of the main plan, it is an idea to think about. Its index row and section leave roadmap.md; a new closing section, "Ideas, not on the roadmap", keeps a paragraph and the link to the notes in plans/inbound-quarantine.md. panel-notifications no longer lists "mail is held in quarantine" among its events. The plans that called it a candidate say what it is now. The drawn screens stay unbuilt, as they were. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
84 lines
3.3 KiB
Markdown
84 lines
3.3 KiB
Markdown
# Plan: inbound-quarantine
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**Status:** an idea to think about, not on the roadmap (owner, 2026-10-12) — 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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## Mockup
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A target look is drawn — list and detail —
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[in-quarantine](../assets/panel-redesign/panel/in-quarantine.html),
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[in-quarantine-message](../assets/panel-redesign/panel/in-quarantine-message.html)
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— under the design contract of [panel-redesign.md](panel-redesign.md). It
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assumes answers to the questions below (SelfPost holds the mail, release goes
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to the upstream, 14 days, headers only in the panel); it does not settle them.
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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
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([architecture.md](../architecture.md) § Mail path).
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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, shipped in `[1.4.0]` — as built in
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[architecture.md](../architecture.md) § Mail path.
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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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