t214.3: Create services/email/email-delivery-test.md — spam filter testing + inbox placement

[github-actions]

Task ID: t214.3 | Status: open | Estimate: ~15m

Notes

EOA spam API: 3 test methods (eoa — content-only from EOA servers, smtp — via your SMTP relay, seed — send to seed addresses for real filter testing). Spam clients: b2b (corporate filters) + b2c (consumer filters). Results: per-filter pass/fail with details. mail-tester.com automation: Playwright to get test address, guide user to send, scrape score + recommendations. Seed list management: reserve via API (GET /v5/spam/seedlist), reuse keys across tests.

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Synced from TODO.md by issue-sync-helper.sh

[marcusquinn]

Closed: task completed and merged.

[marcusquinn]

Reopened: needs verification via proof-log before closing. Task marked [x] but lacks pr: or verified: field.

[github-actions]

Completed. Task t214.3 marked done in TODO.md.

[marcusquinn]

Retroactive PR reference (t291): Completed via PR #929.