4 to 8 minutes between sends.
No machine-gun cadence that screams automation.
Every tool, inbox, and dashboard is provisioned under your ownership — never ours.
Deliverability is not a setting you toggle. It is a reputation you build, byte by byte, across DNS records, warm-up curves, volume ramps, and list hygiene. Get it wrong and every message you send afterward pays the tax, including the ones from your CEO's personal inbox.
We build sending infrastructure the way engineers build production systems. Shadow domains isolate your primary domain completely. Inbox fleets warm on human patterns for weeks before a single prospect email. SPF, DKIM, and DMARC are configured, monitored, and alarmed. Partners scale past a million messages a month this way, holding 98%+ reputation, on domains registered to them, not to us.
Live from the engine room
$engine --status
›shadow domains: 24 warming · reputation 98.2% ✓
›inbox fleet: 142 healthy · ramp on schedule ✓
›dns: SPF ✓ DKIM ✓ DMARC ✓ ✓
›volume this month: 1,004,318 sent · 0.31% bounce ✓
›registered owner: YOU — not us ✓
Built to specification
SPEC 01
Shadow domain architecture
Separate sending domains protect your primary domain's reputation completely.
SPEC 02
Warmed inbox fleets
Dozens of inboxes brought to full sending health before a single prospect email goes out.
SPEC 03
Authentication done right
SPF, DKIM, DMARC configured and monitored — reputation tracked daily at 98%+ targets.
SPEC 04
Volume with discipline
Ramp schedules, rotation, and list hygiene that sustain scale without burning the asset.
Never your primary domain: the isolation model
A deliverability hit on company.com takes your invoices, support replies, and internal mail down with it. Cold outbound never touches it. It runs on a fleet of dedicated lookalike domains that redirect to your real site.
Primary · company.com
Untouched, always
- Internal and transactional only — employee mail, invoices, support.
- Zero cold volume — the reputation your business runs on is never gambled.
Secondary fleet · trycompany.com, getcompany.com
Where outbound lives
- Lookalike domains — 301-redirected to your primary site, so curious prospects land in the right place.
- 2 to 3 mailboxes per domain — small blast radius if any one domain gets flagged.
- Spread across providers — Google Workspace and Microsoft 365 mixed, so no single blocklist takes the fleet down.
Authentication, fully hardened
Filters drop mail from domains with missing or misconfigured authentication before a human ever sees it. Every domain in the fleet carries the full stack, verified and monitored.
SPF
Who's allowed to send
- A DNS record naming exactly which servers can send as your domain.
- Under the 10-lookup limit, so verification never silently breaks.
DKIM
Proof it wasn't tampered with
- A cryptographic signature on every message, verified against your public key.
- 2048-bit keys for maximum strength.
DMARC
What to do on failure
- Tells receivers how to treat mail that fails SPF or DKIM.
- p=none → quarantine → reject, elevated as trust builds, to block spoofing.
Custom tracking domain
Your reputation, not a shared one
- Open and click links run through your own CNAME, not a platform-shared tracker.
- Another sender's spam can't drag your placement down.
Warming: reputation is earned, never rushed
A brand-new inbox has zero reputation. Blast hundreds of emails on day one and it's burned inside 48 hours. Every mailbox climbs a 30-day ramp before it carries real volume.
Day 1Cap 30–40/day
1–14
Pure warmup
Mailboxes join a peer-to-peer warming network. Bots exchange mail, rescue it from spam, mark it important, and thread replies. Zero cold outreach.
15–30
Gradual ramp
Cold outreach starts at 5 to 10 a day, climbing 3 to 5 per day, with warmup still running underneath.
30+
Steady state
Capped at 30 to 40 cold emails per mailbox per day, with background warmup held at a 20 to 30% ratio to keep engagement healthy.
Scale is arithmetic, not optimism
Volume comes from more inboxes, never from pushing any inbox harder. The math tells us exactly how many the target needs.
Inboxes needed
=
Monthly target volumework days × safe daily cap × (1 − warmup ratio)
30kMonthly target
The volume this worked example is sizing infrastructure for.
47Inboxes
30,000 ÷ (20 days × 40 cap × 0.80) rounds up to 47 mailboxes.
19Domains
At 2.5 inboxes per domain, 47 mailboxes means 19 domains running in parallel.
8:30 AM to 5:30 PM, their timezone.
Mail lands when a person is actually at their desk.
Steps spread across the whole fleet.
No single mailbox ever shows an erratic volume spike.
Health monitored live, failover automatic
Deliverability drifts. One bad list or a complaint spike can degrade an inbox. The system watches every mailbox continuously and pulls the trigger before a problem spreads.
< 2%Hard bounce rate
Above 3% signals validation failures and invites carrier throttling.
< 0.1%Spam complaints
Fewer than one complaint per thousand sent, tracked continuously.
> 90%Inbox placement
Weekly seed-list tests confirm primary-inbox landing, not spam or promotions.
The circuit breaker
When a mailbox breaches a threshold, cold sending pauses automatically, pending tasks reroute to pre-warmed backup inboxes, and the affected domain drops into 100% warmup recovery for 14 days. If it doesn't normalize, it's retired and replaced without a campaign ever stalling.
What you own, forever
Your accounts
Your data
Contacts, enrichment, and results live in your CRM as your permanent asset.
Your IP
Playbooks, sequences, and learnings are documented and transferred to your team.
Questions, answered directly
Will cold email hurt our main domain?
No. All outbound sends from dedicated shadow domains registered to you — your primary domain is never exposed.
How many emails can we send?
Partners scale to 1M+ messages per month. Volume ramps with reputation, never ahead of it.
Who owns the domains and inboxes?
You do — registered under your accounts from day one, transferable to your team whenever you choose.
We only win when you close.
Zero management fees. Wholesale infrastructure. A commission of up to 10% that only exists when your deals do. One two-minute conversation tells you if the math works.
Contact Sales →