Land in Primary Inboxes. Automate Sequences. Intercept Replies Instantly.
The high-deliverability cold outreach platform built for modern sales teams and founders. Rotate multiple Gmail sender pools, randomize delivery intervals, and automatically stop follow-ups the millisecond a prospect responds.
"Would love to see a demo this Thursday at 2 PM..."
"Can you send over the technical architecture doc?"
Engineered for Highest Deliverability
Everything you need to run high-volume, safe outbound
Built from first principles to overcome spam filters, rate limits, and slow polling.
Multi-Inbox Gmail Rotation
Connect unlimited Google Workspace & Gmail accounts. Distribute outbound volume across sender pools to preserve domain reputation and bypass single-inbox limits.
GCP Cloud Pub/Sub Webhooks
Zero-latency push notifications instantly detect replies in milliseconds. Sequences automatically stop the moment a prospect responds—guaranteed.
Smart Ramp-Up & Human Jitter
Custom sending windows, randomized send delays (120s–300s), and automated quota ramp-ups emulate organic human activity to stay 100% off spam filters.
CSV Lead Wizard & Deduplication
Ingest up to 50,000 contacts at once. Automatically clean bad records, map custom variables, and prevent embarrassing duplicate touches across team members.
Dynamic Spintax & Variables
Personalize every email with dynamic fallback syntax like {{first_name|there}} and custom company metadata for hyper-targeted, 40%+ open rate copy.
Enterprise Go + Redis Architecture
Engineered with a compiled Go concurrency core, Redis distributed queues, and PostgreSQL for maximum throughput, sub-millisecond sync, and 99.99% uptime.
How Email Flow ensures 99.4% inbox placement
Most cold email tools rely on archaic IMAP/SMTP protocols that trigger Google's suspicious activity warnings. Email Flow uses native Google OAuth2 tokens and asynchronous workers to send messages directly through authorized Gmail APIs.
Cold Email Pipeline vs Legacy Polling
1. Prospect hits reply in Gmail
2. Google sends instant Pub/Sub push event (under 500ms)
3. Sequence paused immediately — No awkward follow-up sent
1. Prospect replies at 10:05 AM
2. Tool is idle until next poll at 11:00 AM
3. Sequence auto-sends follow-up at 10:30 AM — Damages trust
Streamlined Workflow
Launch high-converting outreach in 3 steps
Connect Gmail Accounts
Authorize Google Workspace inboxes with 1-click OAuth. Set daily quota limits and configure sender pools in seconds.
Upload CSV & Map Variables
Import leads with our column mapping wizard. Clean duplicate contacts and insert custom variables like company and role.
Launch Sequences & Track Replies
Activate multi-step sequences with delay conditions. Watch responses stream into your unified inbox in real-time.
Simple & Predictable
Pick the plan that scales with your pipeline
Starter
Perfect for solo founders validating outbound.
- 1 Connected Gmail Account
- Up to 500 emails/month
- CSV Lead Import (up to 1,000 leads)
- Auto-stop on reply
Frequently Asked Questions
Got questions? We've got answers