Automated warmup builds your sender reputation gradually — real conversations, controlled volume increases, health scoring that catches problems before they tank your deliverability.
No credit card required. Domains start warming on day one.
Here's what happens when you skip warmup — and why most people get it wrong
Here's exactly how the warmup process works
Connect your domains. The system handles volume ramp-up, engagement, and monitoring automatically.
Add your sending accounts — SMTP credentials for each domain. The system validates credentials and begins warming immediately. Support for custom domains, Azure communication services, and standard email providers.
Warmup starts at 2 emails per day and increments gradually. The system sends real warmup conversations through established networks — opens, replies, and engagement that tell email providers your domain is legitimate. Target reply rates of 60% build trust fast.
Health scores update continuously. If bounce rates climb above 5%, the domain auto-rests for 7 days before damage spreads. Warmup and cold sending run in parallel — the system adjusts daily limits based on real-time health data.
Week 1-2: 2-8 emails/day
Week 3-4: 12-30 emails/day
Week 5+: 50 emails/day (full capacity)
60% reply rate maintained throughout ramp
Every domain tracked in real time. See who's healthy, who needs rest, and who's ready to send.
reply-engine.com auto-rested after bounce rate exceeded 5%. Resumes in 4 days.
Health score per domain
Auto-rest bounce threshold
Target warmup reply rate
Auto-rest recovery period
Free to try. Warmup begins immediately.
Here's what's happening under the hood to protect your reputation
Email warmup is simple in concept. Getting it right requires tracking dozens of signals simultaneously. The system does that for you.
Each domain gets a health score from 0 to 100, calculated from bounce rate and sending history. Healthy is 70+. Below that, the system takes action — reducing daily limits or resting the domain entirely. You see the score update in real time, not after the damage is done.
When a domain's bounce rate crosses 5%, the system automatically puts it in a rest state. No more emails go out from that domain for 7 days. This prevents a single bad batch from burning a domain that took weeks to warm up. Domains move through clear states: warming → active → resting → active.
Warmup starts at 2 emails per day and increments by 1 each cycle. Every warmup email gets real opens and replies from an established network — not fake engagement that email providers can detect. A 60% reply rate tells Gmail, Outlook, and Yahoo that your domain sends mail people want to read.
You don't have to choose between warming and sending. The system runs both simultaneously on the same accounts. Warmup emails maintain engagement signals while cold emails go to real prospects. Daily limits are split automatically — warmup gets priority, cold email gets the remaining capacity. When health dips, cold volume reduces first to protect the domain.
Bounces aren't always obvious. The system checks every incoming message against 14+ subject patterns — "Delivery Notification," "Undeliverable," "Mail delivery failed," and more. When a bounce is detected, the contact is suppressed globally and the bounce is counted toward the domain's health score. No manual review needed. The system catches what you'd miss.
Warmup starts the day you sign up.
How does this compare to Instantly, Smartlead, and Warmbox?
Most warmup tools tell you your emails are being sent. They don't tell you whether your domain is actually healthy.
| This Platform | Instantly Warmup | Smartlead | Warmbox | |
|---|---|---|---|---|
| Health scoring |
0-100 per domain
Auto-calculated from bounces + volume |
Warmup score only
No bounce correlation |
Basic health
No auto-action |
Inbox rate %
No domain-level score |
| Auto-rest on damage |
Yes, automatic
>5% bounce → 7-day rest |
Manual only | Manual only | Manual only |
| Warmup + cold email |
Same platform
Shared data, auto-limit splitting |
Same platform
Separate billing |
Same platform
Per-account pricing |
Warmup only
No sending capability |
| Bounce detection |
14+ patterns
IMAP-based, auto-suppress |
Basic detection
API-based |
Basic detection
API-based |
Inbox placement only
No bounce tracking |
| Domain state management |
5 states
Active → Warming → Resting → Retired |
On/Off
Manual toggle |
Active/Paused
Manual control |
Active/Paused
No state machine |
| Pricing |
Flat rate
Unlimited domains |
$30-97/mo
Per seat, account limits |
$39-174/mo
Per active account |
$15-159/mo
Per inbox, no sending |
Standalone warmup tools charge $15-97/month and only tell you if warmup emails are being exchanged. They can't tell you whether your domain is actually building reputation, because they don't see your real sending data. This platform does — warmup and cold email share the same database, so health scores reflect reality.
Still not sure? Zero risk to find out.
Connect your domains, start warming, and see health scores climb before you're ever asked to pay.
No contracts. No annual commitment. The reputation your domains build is yours to keep.
Add your accounts, and the system starts building reputation immediately. No setup calls, no waiting periods.
Try it free, cancel anytime.
I burned through 6 domains in my first year of cold email. Not because my emails were bad — because I had no idea my deliverability was tanking until it was too late.
The warmup tools I was paying for said everything looked fine. Green lights across the board. But those tools only tracked warmup emails — they had no visibility into my actual cold sending volume, bounce rates, or domain health. By the time I realized something was wrong, Gmail had already flagged my domains.
I needed a system that tracked the full picture. Warmup engagement and cold sending bounces, in the same database, updating the same health score. When the bounce rate ticked up, the system should react — not wait for me to check a dashboard three days later.
That's what this is. Warmup, health scoring, auto-rest, and cold email — sharing one database. Your domains get protected automatically, because the system sees everything, not just the warmup half.
Your competitors are warming their domains right now. The ones who started last month are already landing in inboxes you're not.
Start Warming Up TodayNo credit card. No contracts. Domains start warming immediately.