Deliverability infrastructure
Five to ten sender domains rotated on a steady cadence. Six weeks warming before promotion. SPF + DKIM + DMARC on every tier, BIMI on Scale. Postmaster reputation drives an automatic circuit breaker.
Deliverability is the table-stakes problem. Smartlead has four years of head start on us here and we do not claim to beat them — we claim parity, with the difference being that our reputation circuit breaker fires earlier because the audit trail makes the consequence of a bounce spike measurable.
Sender pools
- Five to ten domains per tenant pool. Each domain has a daily cap that grows on a logistic schedule for six weeks before it is considered "warm".
- Rotation is fair-share within a campaign — we never burn a single domain to clear a queue.
- Cold pools are isolated. A new domain is never mixed into a warm pool until it has cleared the warmth threshold.
DNS posture
- SPF — strict, hard-fail. Aligned with DKIM signer.
- DKIM — 2048-bit key per domain. Rotated every 12 months.
- DMARC — p=quarantine on Starter, p=reject on Growth+. RUA reports parsed nightly into Chainlog.
- BIMI — only on Scale. Requires a VMC certificate which we provision.
Circuit breaker
We pull Postmaster Tools (Google) and SNDS (Microsoft) on a 15-minute cadence. A reputation step-down or a complaint rate above 0.1% pauses the affected pool automatically. Resumption is gated on a 24-hour cooldown plus a manual ack from /dashboard/domains.
Two free MCP tools surface this pipeline inside Cursor or Claude Desktop — no key required.