The Engine Pricing About Contact Join Waitlist

Cold Email Infrastructure - June 2026 Launch

Send like the big players.
Pay like a solo op.

$19 /mo
$97–$297 elsewhere Up to 93% less

Multi-inbox rotation, auto-warmup, bounce protection, reply detection, DKIM/DMARC compliance. Every feature the enterprise tools have. One price that makes sense for one person.

Join the Waitlist View Pricing

  Waitlist open - limited to first 200 operators

Core Mail Engine - Dashboard

Domain Health

mx.outreach-01.io 97%
send.campaignco.io 94%
mail.prospects.net 81%
relay.cold-sends.io 88%

Warmup Curve

4 inboxes warming

Replies

A

[email protected]

Saw your message - let's chat

C

[email protected]

Yes, schedule something this week

S

[email protected]

Followed up. Demo looks solid

3 replies • 12,400 sends today • All systems operational
200

Spots Available

Early-adopter price locked for life

Jun

2026 Launch

Waitlist signups get first access

$19

Since Day One

Price will not change for first 200

The Engine

Every feature.
No tiers. No upsells.

Deliverability Suite

SPF, DKIM, DMARC.
Done automatically.

Core Mail Engine configures and monitors your full deliverability stack. No DNS spelunking. No consultant required.

AUTO-CONFIGURED
SPF / DKIM / DMARC
AUTO-PAUSED
If bounces exceed 5%

Auto Warmup

Ramps each inbox from 5 → 100 sends/day over 30 days.

Reply Detection

Auto-stops the sequence the moment they reply.

No awkward follow-up to someone who already said yes.

Multi-Inbox Rotation

Up to 99 sending domains, rotated automatically.

99
Max domains

Unified Inbox

Every reply, one place.

All inboxes, all domains, threaded by lead.

10,000 sends/day

Full capacity on day one. Auto-pacing keeps you out of spam filters without throttling your pipeline.

Learn how it works →

Pricing

Up to 93% less than Instantly.

Same deliverability infrastructure. None of the enterprise tax on a solo operator's budget.

Feature Instantly Smartlead Lemlist Mailshake Core Mail Engine
Price/mo $97 $49 $69 $99 $19
Multi-inbox rotation ✓ ✓ - - ✓
Auto warmup ✓ ✓ ✓ - ✓
Reply detection ✓ ✓ ✓ ✓ ✓
DKIM/DMARC ✓ ✓ ✓ ✓ ✓
Unified inbox ✓ ✓ ✓ ✓ ✓
10K sends/day ✓ ✓ - - ✓
No seat fees - - - - ✓
$19/mo

Every feature above - no tiers - no upsells

Join the Waitlist

Why I am building this

I built this engine for my own agency because I could not justify $97 a month for Instantly when I was running cold outreach by myself. It worked. So I am releasing it to other solo operators in the same spot. No team. No investors. No subscription tax.

Tre Smith

Founder, Core Mail Engine

LinkedIn
20 years senior architect

June 2026 Launch

$19

/mo - forever

Lock in early-adopter pricing before we launch.

First 200 operators get $19/mo locked in for life. No trial period. No bait-and-switch pricing after month three.

Join the Waitlist View Full Pricing

No credit card required - waitlist confirmation only