Warm up your mailbox the way Gmail and Outlook actually trust.
Like a real user. No APIs. No SMTP. No automation fingerprints.
Free forever for 1 mailbox
Traditional Warmup Tools Are Broken
Every warmup service on the market connects to Gmail and Outlook through APIs or SMTP. Providers see this - and it's exactly what spam filters are trained to detect. Your deliverability tanks, and you never know why.
API Detection
Every tool sends through APIs or SMTP. Gmail and Outlook see this and treat it differently from genuine web-based sending.
Shared Reputation
Premium IP pools don't fix the core problem. You're sharing reputation with strangers who may be doing the exact things that hurt deliverability.
Diminishing Returns
Recommended daily limits keep dropping: 25 -> 20 -> 10. The tools themselves are becoming less effective every month.
Your Personal Gmail and Outlook Never Land in Spam
Think about it: when you compose a draft, hit send through the web interface, and your friend replies - Gmail and Outlook see genuine behavior from a real browser on a real IP.
That's the signal that builds reputation. Thawing Fox does exactly this - automates the send-and-reply loop inside the browser, the same way you would by hand.
How Thawing Fox Works
Three steps to a warmer inbox.
Install the Extension
Add the Chrome extension. Connect your mailboxes.
Join the P2P Network
Your mailbox exchanges warmup emails with real users on real IPs.
Watch Your Reputation Grow
Track inbox placement, spam rate, and deliverability in real time.
Real Peer-to-Peer Warmup
Every warmup email is sent and received by real users on distinct residential IPs. No shared servers, no pooled domains.
A credit system ensures fair exchange: send one, receive one. Real Gmail and Outlook interactions, real browser sessions, real reputation building.
Spintax Templates That Sound Human
Our template system generates thousands of unique variants from spintax patterns. Every email reads like a real person wrote it.
Templates are randomly selected and freshly rendered each time - no two warmup emails are alike.
Know Exactly Where Your Emails Land
Track whether each warmup email landed in the inbox or spam. See 7-day trends and per-mailbox health at a glance.
Real data, not estimates. Thawing Fox checks actual placement so you know your reputation is growing.
Built for People Who Care About Deliverability
Founders & Startups
Own 1-5 mailboxes. Can't afford to gamble domain reputation on a tool that might get you flagged.
Sales Teams
Cold outreach that actually reaches the inbox. Warm up sender accounts before campaigns go live.
Freelancers
Your reputation is your business. Keep your personal domain healthy without the overhead.
Agencies
Contact us - we have something special for you. Multi-mailbox management built for scale.
Simple, Transparent Pricing
Choose monthly or yearly billing. Cancel anytime.
Starter
1-day free trialFor founders & small teams
$29/mo $19 /mo
- 10 warmup mailboxes
- Unlimited daily emails
- Tracking detection
- Bulk warmup
Growth
PopularFor teams scaling cold outreach
$99/mo $59 /mo
- 100 warmup mailboxes
- Unlimited daily emails
- Tracking detection
- Bulk warmup
- Priority support
Agency
For larger fleets & custom onboarding
Talk to us
Custom pricing
- 1000 warmup mailboxes
- Custom rollout support
- Priority onboarding
Prefer to try before you pay? Install free and warm up 1 mailbox forever.
Start Warming Up Your Inbox Today
Free forever for 1 mailbox. No credit card required.
Install for Chrome - It's Free