Technical Email Deliverability Checklist
Audit Yahoo & Gmail 2024+ bulk sender requirements, complaint ceilings, and inbox placement factors.
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### 1. DNS Authentication Compliance
- [ ] **SPF Alignment:** Single TXT record starting with `v=spf1`, ending in `~all`, with < 10 DNS lookups.
- [ ] **DKIM Alignment:** 2048-bit key verified with matching selector published in DNS.
- [ ] **DMARC Record:** Published at `_dmarc.yourdomain.com` with valid `rua=` reporting mailbox.
- [ ] **Custom Return-Path (Mail-From):** CNAME aligned with the friendly From: domain.
### 2. Mailbox Provider Compliance (Google & Yahoo 2024 Rules)
- [ ] Google Postmaster Tools spam complaint rate verified < 0.10% (strict ceiling 0.30%).
- [ ] RFC 8058 One-Click List-Unsubscribe header configured in email service provider.
- [ ] Reverse DNS (PTR record) correctly resolves to the hostname of the sending server.
### 3. Sending Hygiene & Infrastructure
- [ ] Dedicated sending subdomain separated from corporate internal email (e.g. `mail.domain.com`).
- [ ] Automated hard bounce suppression operational (hard bounces suppressed on first occurrence).
- [ ] Automated sunset policy actively suppresses contacts after 90 days of total inactivity.
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