Deliverability isn't a one-time setup — it's a weekly review cycle.
Weekly checklist:
- Pull Gmail Postmaster Tools — domain reputation, IP reputation, complaint rate.
- Pull Microsoft SNDS — IP color (green/yellow/red), filter results.
- Pull MailVitals (or competitor) for inbox placement seed test.
- Review top bounce categories per tenant — adjust suppression aggressiveness.
- Adjust shaping.toml for destinations that throttled.
- Rotate DKIM selector if >12 months old.
- Re-check DMARC enforcement: still p=reject? aggregate reports clean?
Quarterly:
- Warm a fresh IP pair as cold-standby (so you have warm spares for emergencies).
- Audit shaping.toml against actual queue behavior — old rules go stale.
- Run inbox placement tests across all major destinations.
Annually:
- Rotate DKIM keys (new selector, retire old after 30 days).
- Re-evaluate IP pool sizes vs sending volume.
- Renegotiate IP block leases with hosting provider if needed.
🌍 Deliverability is the long game. Process beats heroics.
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