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Fix DMARC guidance for send-only relays with optional rua= settings.

The panel now suggests policy-only DMARC by default, lets operators configure a default and per-domain report address, and DNS-checks hub _report._dmarc records. Future in-panel report ingestion is tracked as dmarc-reports in the roadmap.

Co-authored-by: Cursor <cursoragent@cursor.com>

2026-08-10 22:47:34 +03:00

1.7 KiB

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Plan: dmarc-reports

Status: candidate

Goal

SelfPost receives DMARC aggregate reports on SMTP, parses them inside the image, and shows summaries in the panel — pass/fail by source, hints when tighten p= is reasonable. No external DMARC SaaS and no IMAP workflow for the operator.

Scope

In:

Inbound SMTP for configured report addresses only (not a general backup-MX).
gzip + XML aggregate parsing → SQLite summaries per sending domain.
Panel page and/or per-domain section: recent reports, third-party senders, delivery health of report ingestion.
Reuse admin.dmarc_report_email and domains.dmarc_rua for DNS templates; when enabled, suggest a SelfPost-hosted report address.

Out:

Forensic reports (ruf=).
Full dashboards, APIs, email alerting.
Mailboxes for people (IMAP/POP3/webmail).

Architecture (sketch)

Receiving MTAs → SMTP to SelfPost (hub MX).
Postfix virtual alias or dedicated listener → panel ingest worker.
Parse XML → dmarc_reports table (domain, reporter, counts, date).
Panel reads SQLite; links from domain DNS card.

May share port-25 plumbing with inbound-relay.md but must remain a separate, opt-in feature that does not forward mail upstream.

Done when

Operator can point rua= at an address SelfPost accepts and see parsed summaries in the panel within one reporting cycle.
With the feature off, outbound-only behaviour is unchanged.
Documented in guide.md; migrations are backward-compatible.

Risks

Attack surface of accepting mail (mitigate: strict recipient allow-list).
Report volume and retention (mitigate: caps + pruning).

1.7 KiB Raw Blame History