Warmup network
1M+
Real email accounts in Instantly’s warmup network, and it keeps growing. A bigger network means a better sending reputation for your accounts.
Instantly Warmup
Keep your cold emails out of spam
Instantly sends and replies to warmup emails across a warmup network of 1M+ real accounts, so inbox providers learn to trust you.
No credit card requiredTrusted by 50,000+ sales teams
Email accounts
1 of 3 healthyalex@yourdomain.com
Day 3 of slow ramp
Day 3 of slow ramp
Warming6 warmup emails today
sam@yourdomain.co
Day 9 of slow ramp
Day 9 of slow ramp
Warming18 warmup emails today
jo@tryyourdomain.com
Ready to send
Ready to send
Healthy30 warmup emails today
New mailboxes start with no reputation
Inbox providers judge a sender by its history. A new or idle mailbox that suddenly sends cold email looks risky, so your messages get filtered to spam, replies dry up and your domain’s reputation takes the hit. And nothing tells you it’s happening.
Spam
3 conversations- Spam
You 9:42 AM
Quick question about your Q3 pipeline
- Spam
You 9:44 AM
Intro: helping your team book meetings
- Spam
You 9:47 AM
Following up
Primary inbox: 0 of your emails
Brand-new domains and inboxes
A mailbox created last week has no history, so providers have nothing to trust it with yet.
Mailboxes that have gone quiet
An account that sat idle for months loses the standing it once had and starts again from cold.
Sending volume that jumps overnight
Going from a handful of emails to hundreds a day is exactly the pattern spam filters watch for.
Warm up in three steps
Set it up once and Instantly keeps your mailboxes warm in the background.
Step 1
Connect your email accounts
Connect your sending accounts to Instantly, including Google Workspace and Microsoft Outlook mailboxes.
Step 2
Turn on warmup in one click
Once your accounts are connected, switching on warmup takes a single click per account.
WarmupStep 3
Watch reputation build
Instantly sends, opens and replies to warmup emails between your accounts and the warmup network, building trust day by day.
See when your inbox is ready to send
Instantly’s Deliverability Dashboard shows your deliverability score and exactly how many emails land in inbox versus spam, so you know when accounts are ready and when they need longer.
Deliverability score
96%after 4 weeks
- Deliverability score
- Inbox placement
Example data for illustration. Your dashboard shows the results of your own accounts.
Built for cold email at scale
Every part of Instantly Warmup is designed to make your mailboxes look like real people sending real email.
Slow ramp
Accounts warm up naturally: Day 1 sends 2 emails, Day 2 sends 4, Day 3 sends 6 and so on, protecting your domain and account deliverability. The exact number varies each day.
- Day 1: 2 emails
- Day 2: 4 emails
- Day 3: 6 emails
- Day 4: 8 emails
- Day 5: 10 emails
Reads like a real person
The system spends time scrolling through warmup emails to emulate human-like reading.
Randomized daily volume
A random number of warmup emails goes out each day, so your sending never follows a fixed pattern.
Custom targets
Choose the exact open rate, response rate and spam protection for your warmup emails.
Looks like real devices
Warmup runs through a private network of headless browsers, so activity comes from real-looking devices.
Join 50,000+ sales teams who’ve made the switch to Instantly
“Instantly became the backbone of our outreach - over 100,000 emails sent across 20+ domains with 20%+ reply rates and a steady stream of qualified leads. It’s not just a sending tool, it’s our growth engine.”
Frequently asked questions
Warmup automatically sends, receives, opens and replies to emails between your connected accounts and the warmup network, building your sender reputation. It runs through a private network of headless browsers with read emulation, so interactions look like real reading. Once your accounts are connected, you activate it in one click.
Can’t find the answer? Visit the Instantly help center.
Get your mailboxes inbox‑ready
Connect your accounts, turn on warmup and watch your deliverability score climb.
No credit card required.