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Security: configure DMARC on mill.keywind.cc #10

Description

@brocla

Backlog: Security & deployment hardening

Problem

DMARC is not configured on mill.keywind.cc. Replies currently land in the recipient's inbox (verified with Proton), so this is low priority today — but it matters for deliverability at scale and is a prerequisite before any migration to the real domain (whidit.com).

Proposed solution

  • Add a DMARC TXT record at _dmarc.mill.keywind.cc (start p=none, monitor-only), aligned with the existing SPF + DKIM that Mailgun already verifies.
  • Watch out for the Cloudflare gotcha documented in EMAIL-PIPELINE.md: Cloudflare's DMARC Management feature silently reasserts a competing dmarc-reports.cloudflare.net record unless disabled per-zone (Email → DMARC Management → disable). And Cloudflare's DNS form auto-appends the zone, so enter the name as _dmarc.mill, not the full host.

Notes

  • Only pursue as part of improving reply deliverability or the whidit.com migration; not needed for current functionality.

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