The reason your cold email lands in the inbox.
Every other tool sells you a sequencer and tells you deliverability is your problem. We sell you the infrastructure layer they hide from you — and surface every signal so you can see the system working.
Network medians from anonymized aggregate data. Live numbers update on the benchmarks page.
Six layers, working together.
Cold email deliverability isn't one trick. It's a stack of decisions enforced at every level — domain, mailbox, IP, content, cadence, reputation. We make all of them, and we make them visible.
Real-mailbox warmup peering
Warmup runs through CheddarInbox — a private peer-to-peer network where every email lands in a real mailbox owned by another tenant on the network. Real human-pattern engagement (open, reply, archive, mark-not-spam) generates real reputation signals at Gmail, Outlook, and Yahoo. No synthetic traffic, no public warmup pools, no detection by mailbox providers.
Per-mailbox reputation scoring
Every mailbox carries its own bounce rate, complaint rate, and engagement window. We don't rotate to a mailbox the moment it spikes. The platform pauses warmup, flags the mailbox, and keeps it out of the rotation until it heals. Single-mailbox burnout doesn't poison the domain.
Domain rotation enforced at send-time
You can't accidentally send 5,000 emails from one domain because the UI lets you. The send queue picks the next eligible mailbox by health score — not the one you typed last. Cap-per-domain, cap-per-mailbox, and cap-per-IP gates run on every send.
Native SendGrid stats reconciliation
We pull mailbox-provider-bucketed stats (Gmail, Google Apps, Yahoo, Outlook, other) directly from the SendGrid Stats API every night. Bounce, deferral, complaint, and unique-open rates roll up into mt_reputation_daily. No dependency on Google Postmaster Tools enrollment, no per-domain manual verification, no Gmail-only blind spots.
Auto-pause on bounce/complaint thresholds
Hard bounce rate over 5%, complaint rate over 0.1%, or sustained deferrals trigger automatic warmup pause + alert. The mailbox stays receivable (you don't lose replies) but stops sending until the rates recover. Bad lists hit the brakes before they hit the ban hammer.
Auth standards enforced — not optional
SPF, DKIM, and DMARC are configured on every domain at provisioning. We don't ship a domain to production sending without all three resolving correctly. DKIM is dual-selector (SendGrid s1 + s2) so a single key rotation doesn't take you offline.
Every signal, visible.
Most platforms hide reputation behind support tickets. We surface the same dashboards we use to run the network.
- Per-mailbox health score (bounce + complaint + warmup state)
- Per-domain reputation timeline by mailbox provider
- Daily reply rate trend across all sequences
- Auto-pause history — every flagged mailbox, every reason
- SPF / DKIM / DMARC live status (re-checked every 6h)
- Suppression list — bounces and complaints flow into a global sink, never re-mailed
See the dashboard before you sign up.
The reputation rollup, mailbox health page, and benchmarks data are all visible in your account from day one — before you send a single email.